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Medical Terminology Prefixes, Suffixes, and Combining Forms "O"

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Question
Answer
obes/o-   fat  
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obsess/o-   besieged by thoughts  
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obstetr/o-   pregnancy and childbirth  
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obstip/o-   severe constipation  
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obstruct/o-   blocked by a barrier  
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occiput/o-   occiput (back of head)  
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occlus/o-   close against  
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ocul/o-   eye  
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odont/o-   tooth  
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odyn/o-   pain  
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-oid   resembling  
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-ol   chemical substance  
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-ole   small thing  
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olfact/o-   the sense of smell  
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olig/o-   scanty; few  
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olisthe/o-   slipping  
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-olisthesis   abnormal condition with slipping  
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-oma   tumor; mass  
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-omatosis   abnormal condition of multiple tumor or masses  
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oment/o-   omentum  
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om/o-   tumor; mass  
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omphal/o-   umbilicus; navel  
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-on   a substance; structure  
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onc/o-   tumor; mass  
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-one   chemical substance  
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onych/o-   nail (fingernail or toenail)  
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o/o-   ovum (egg)  
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oophor/o-   ovary  
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operat/o-   perform a procedure; surgery  
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ophidi/o-   snake  
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ophthalm/o-   eye  
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-opia   condition of vision  
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opportun/o-   well-timed; taking advantage of an opportunity  
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oppos/o-   forceful resistance  
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-opsy   process of viewing  
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optic/o-   lenses; properties of light  
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opt/o-   eye; vision  
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-or   person or thing that produces or does  
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orbicul/o-   small circle  
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orbit/o-   orbit (eye socket)  
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orchi/o-   testis  
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orch/o-   testis  
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orex/o-   appetite  
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organ/o-   organ  
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or/o-   mouth  
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orth/o-   straight  
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-ory   having the function of  
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-ose   full of  
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-osing   condition of doing  
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-osis   condition; abnormal condition; process  
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osm/o-   the sense of smell  
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osse/o-   bone  
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ossicul/o-   ossicle (little bone)  
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ossificat/o-   changing into bone  
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oste/o-   bone  
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ot/o-   ear  
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-ous   pertaining to  
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ovari/o-   ovary  
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ov/i-   ovum (egg)  
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ov/o-   ovum (egg)  
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ovul/o-   ovum (egg)  
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ox/i-   oxygen  
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ox/o-   oxygen  
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ox/y   oxygen; quick  
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