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PT Medical Terms
Medical Term Pre-fixes
| Prefix | Meaning | Example |
|---|---|---|
| A-, An-, (before vowel) | without, lack of | apnea (without breath) |
| Ab- | away from | abnormal, abductor |
| Ad-, Af- | to, toward | adductor, afferent, adhesion |
| Ana- | up, back again | anabolic |
| Anti- | against | antisepsis |
| Apo- | away from | apochromatic (abnormal color) |
| Auto- | to do with self | autolysis, autopsy |
| Bi- | relating to two | bifurcation (separation into 2 branches) |
| Brachy- | short | brachycephalia (short head) |
| Brady- | slow | bradycardia, bradypnea (slow breathing) |
| Circum- | around | circumflex (winding about), circumcision (ouch) |
| Con- | with | congenital (born with) |
| Contra- | against, opposite | contraception, contralateral |
| Crypto- | hidden, concealed | cryptorchid (undescended testicle) |
| Cryo- | cold | cryotherapy |
| De- | away from | dehydrate |
| Dextro- | right | dextrocardia (pertaining to right side of heart |
| Di- | twice, double | diplopia (double vision) |
| Dia- | through, apart, across | diaphragm, diapedesis |
| Dys- | Bad, difficult | dyspnea (difficult breathing); Dysphagia (difficulty in eating) |
| E-, Ex-, Ef- | out, away from | eviscerate (remove viscera), efferent |
| Ec-, Ecto- | out, outside | eccentric, ectopic (out of place) |
| Em-, En- | in | encephalopathy (any brain disease) |
| Endo- | within | endometrium (inner lining of uterus), endoscope |
| Epi- | upon | epigastric |
| Eu- | well, good, normal | euphoria, euthyroid, eupea |
| Gravis- | heavy | gravida (pregnant woman) |
| Haplo- | single, simple | haplodermatitis (simple inflammation of the skin) |
| Hemi- | half | hemiplegia (paralysis on one side) |
| Hetero- | other, different | heterogenous |
| Homo- | same | homogenous |
| Hydro- | wet, water | hydronephrosis (urine collecting in renal pelvis) |
| Hyper- | over, above, excessive | hyperplasia (excessive formation) |
| Hypo- | under, below, deficient | Hypotension (low blood pressure) |
| Idio- | distinctive, peculiar to | idiopathic (disease of unknown cause), idiosyncrasy |
| Im-, In- | in, into | infiltration |
| Im-, In- | not | immature |
| Infra- | below | infraorbital (below eye socket) |
| Inter- | between | intercostal (between ribs) |
| Intra- | within | intraocular (within the eye) |
| Iso- | same, equal | isometric, isotonic |
| Leuko- | white | leukocyte |
| Levo- | left | levocardia (left side of heart) |
| Mal-, Malus- | bad | malignant, malformation |
| Mega- | large, great | megacolon (large colon), megaloblastic |
| Meso- | middle | mesoderm |
| Micro- | small | microglossia (small tongue) |
| Mono- | one, single | monochromatic |
| Multi- | many, much | multiparous (having given many births) |
| Necro- | having to do with death | necrosis, necropsy |
| Neo- | new | neoplasm (literally - new formation) |
| Oligo- | few, little | oligouria (formation of little urine) |
| Opistho- | behind, backward | opisthotic (behind the ears) |
| Ortho- | straight, normal, | orthopnea (able to breath only in correct, upright position) |
| Para- | beside, by side | paraplegia (paralysis of both sides), parathyroids |
| Per- | through | percutaneous |
| Peri- | around | periosteum (membrane around the bone) |
| Poikilo- | varied | poikiloderma (mottled skin), poikilothermic |
| Poly- | many, much | polymyalgia (pain in many |
| Post- | after, behind | postnatal (after birth) |
| Pre- | before, in front of | prenatal |
| Pro- | before, in front of | prognosis (foreknowledge) |
| Pseudo- | FALSE | pseudostratified |
| Re- | back, again | regurgitation |
| Retro- | backward, located | retroperitoneal (behind the peritoneum) |
| Sclero- | hard | sclerosis (hardening), arteriosclerosis |
| Semi- | half | semilunar (half moon, i.e., valves in aorta) |
| Sub- | under | sublingual |
| Super- | above, upper | supernatant |
| Supra- | above, upper | suprarenal |
| Steno- | narrow | stenosis (narrowing or constriction) |
| Sym-, Syn- | together, with | synapse, symphysis |
| Tachy- | fast, swift | tachycardia |
| Trans- | across, through | transection (cut across) |
| Tri- | three | tricuspid (heart valve) |
| Xero- | dry | xerodermia (dry skin) |
| Prefix | Meaning | Usage and/or Examples |