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Medical Terminology Root Words

        Help!  

Term
Definition
abdomin/o   abdomen  
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aden/o   gland  
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adenoid/o   adenoids  
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adren/o   adrenal glands  
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alveol/o   alveolus (air sac within the lung)  
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amni/o   amnion (sac surrounding embryo)  
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angi/o   vessel (blood)  
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append/o, appendic/o   appendix  
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arteri/o   artery  
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arteriol/o   small artery  
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arthr/o   joint  
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ather/o   fatty plaque  
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axill/o   armpit  
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balan/o   penis  
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bari/o   weight  
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bi/o   life  
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blephar/o   eyelid  
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bronch/o   bronchial tube  
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bronchiol/o   small bronchial tubes  
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calcane/o   calcaneus (heel bone)  
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capillar/o   capillary  
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carcin/o   cancer, cancerous  
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cardi/o   heart  
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carp/o   wrist bones (carpal)  
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cephal/o   head  
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cerebell/o   cerebellum (posterior part of the brain)  
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cerebr/o   cerebrum (largest part of the brain)  
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cervic/o   neck  
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chem/o   drug, chemical  
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cholecyst/o   gallbladder  
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choledoch/o   common bile duct  
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chondr/o   cartilage  
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chron/o   time  
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cis/o   to cut  
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clavicul/o   clavicle (collarbone)  
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coccyg/o   tailbone  
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col/o   colon (large intestine)  
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colon/o   colon (large intestine)  
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colp/o   vagina  
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comi/o   to care for  
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coni/o   dust  
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coron/o   heart  
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cost/o   rib  
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crani/o   skull  
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crin/o   secrete  
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cry/o   cold  
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cutane/o   skin  
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cyan/o   blue  
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cyst/o   urinary bladder  
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cyt/o   cell  
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dactly/o   fingers or toes  
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dent/i   tooth  
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dermat/o, derm/o   skin  
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duoden/o   duodenum  
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dur/o   dura mater (outermost meningeal layer)  
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electr/o   electricity  
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encephal/o   brain  
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endocrin/o   endocrine glands  
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endometr/o, endometri/o   endometrium (inner lining of the uterus)  
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enter/o   intestines (small intestines)  
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epiglott/o   epiglottis  
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epitheli/o   skin (surface tissue)  
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erythr/o   red  
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esophag/o   esophagus  
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esthesi/o   sensation  
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femor/o   femur, thigh bone  
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fibr/o   fibrous tissue  
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fibul/o   fibula (smaller lower leg bone)  
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gastr/o   stomach  
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gen/o   to produce  
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ger/o   old age  
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glyc/o   sugar  
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gnos/o   knowledge  
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gynec/o   woman, female  
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hemat/o, hem/o   blood  
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hepat/o   liver  
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humer/o   humerus (upper arm bone)  
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hydr/o   water  
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hypophys/o   pituitary gland  
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hyster/o   uterus  
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iatr/o   treatment  
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ile/o   ileum (third part of small intestine)  
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ili/o   ilium (upper part of hip bone)  
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inguin/o   groin  
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isch/o   to hold back  
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jejun/o   jejunum  
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lapar/o   abdomen  
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laryng/o   larynx (voice box)  
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later/o   side  
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ligament/o   ligament  
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leiomy/o   smooth muscle  
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leuk/o   white  
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lip/o   fat  
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lith/o   stone  
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lumb/o   loin, waist region  
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lymph/o   lymph  
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lymphaden/o   lymph nodes  
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lymphangi/o   lymph vessel  
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lys/o   breakdown, destruction, separation  
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mamm/o   breast  
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mast/o   breast  
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mediastin/o   mediastinum  
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medull/o   medulla oblongata (lower part of the brain)  
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men/o   menstruation  
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mening/o   meninges (membranes covering brain and spinal cord)  
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metacarp/o   metacarpals (hand bones)  
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metatars/o   metatarsals (foot bones)  
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metr/o, metri/o   uterus; to measure  
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muscul/o   muscle  
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my/o   muscle  
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myel/o   bone marrow (with -blast, -cyte, -genous, -oma)  
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myel/o   spinal cord (with -cele, -gram, -itis)  
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myos/o   muscle  
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myring/o   eardrum  
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nas/o   nose  
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nat/i   birth  
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necr/o   dead  
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nephr/o   kidney  
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neur/o   nerve  
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norm/o   rule, order  
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nos/o   disease  
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obstetr/o   midwife  
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ocul/o   eye  
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odont/o   tooth  
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onc/o   tumor  
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onycho/o   nail  
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o/o   egg  
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oophor/o   ovary  
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ophthalm/o   eye  
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opt/o, optic/o   eye  
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or/o   mouth  
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orch/o   testicle, testis  
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orchi/o   testicle, testis  
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orchid/o   testicle, testis  
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orth/o   striaght  
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osm/o   smell  
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oste/o   bone  
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ot/o   ear  
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ovari/o   ovary  
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pancreat/o   pancreas  
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parathyroid/o   parathyroid gland  
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path/o   disease  
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ped/o   child  
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pelv/o   hip bone  
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peritone/o   peritoneum (membrane around abdominal organs)  
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perone/o   fibula  
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phak/o   lens of the eye  
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phalang/o   phalanges (finger and toe bones)  
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pharyng/o   pharynx, throat  
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phleb/o   vein  
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phren/o   diaphragm  
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phren/o   mind  
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pituitar/o   pituitary gland  
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plas/o   developmental, formation, growth  
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pleur/o   pleura (membrane around the lungs)  
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pneum/o   air, lung  
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pneumon/o   lung  
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poster/o   behind  
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prosth/o   artificial replacement  
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proct/o   anus and rectum  
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prostat/o   prostate gland  
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psych/o   mind  
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pulmon/o   lung  
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pyel/o   renal pelvis (central section of the kidney)  
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radi/o   x-ray; radius (lateral lower arm bone)  
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rect/o   rectum  
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ren/o   kidney  
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retin/o   retina of the eye  
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rhabdomy/o   striated (skeletal) muscle  
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rheumat/o   flow, fluid  
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rhin/o   nose  
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sacr/o   sacrum  
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salping/o   fallopian tube; eustachian tube  
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sarc/o   flesh  
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scapul/o   shoulder blade (bone)  
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scrot/o   scrotal sac, scrotom  
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sept/o   infection  
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septic/o   infection  
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son/o   sound  
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spin/o   backbone, spine, vertebrae  
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splen/o   spleen  
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spondyl/o   backbone, vertebrae  
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stern/o   sternum (breastbone)  
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stomat/o   mouth  
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tendin/o, ten/o   tendon  
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theli/o, thel/o   nipple  
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thorac/o   chest  
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thromb/o   clot  
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thym/o   thymus gland  
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thyr/o, thyroid/o, thyroaden/o   thyroid gland  
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tibi/o   tibia or shin bone (lower leg bone)  
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tonsill/o   tonsils  
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top/o   to put, place  
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trache/o   trachea, windpipe  
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troph/o   development, nourishment  
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tympan/o   eardrum  
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uln/o   ulna (medial lower arm bone)  
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ungu/o   nail  
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ureter/o   ureter  
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urethr/o   urethra  
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ur/o   urine, urinary tract  
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uter/o   uterus  
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vagin/o   vagina  
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vas/o   vas deferens, vessel  
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vascul/o   blood vessel  
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ven/o   vein  
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venul/o   venule  
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vertebr/o   backbone, vertebra  
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vesic/o   urinary bladder  
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