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Medical Word Parts - Letter: o
| Term | Definition |
| ob- | against |
| obstetr/o | midwife |
| oct- | eight |
| ocul/o | eye |
| odont/o | tooth |
| odyn- | pain |
| -oid | resembling |
| -ole | small, little |
| oleo- | oil |
| olfact/o | smell |
| olig/o | few, scanty |
| om/o | shoulder |
| -oma | tumor, neoplasm |
| omphal/o | umbilicus (navel) |
| onc/o | swelling, tumor |
| onych/o | fingernail, toenail |
| oophor/o | ovary |
| ophry/o | eyebrow |
| ophthalm/o | eye |
| -opia | vision condition |
| opisth- | behind |
| -opsy | process of viewing |
| opt/o | eye, vision |
| or/o | mouth |
| orchid/o | testicles |
| -orexia | appetite |
| organ/o | organ |
| ori- | mouth |
| orth/o | straight |
| osche/o | scrotum |
| oscill/o | swing |
| -ose | a carbohydrate |
| -osis | abnormal condition |
| osm/o | sense of smell |
| oss/e | bone |
| oss/i | bone |
| oste/o | bone |
| ot/o | ear, hearing |
| -ous | pertaining to |
| ov/o | egg, ovum |
| ovari/o | ovary |
| ox/i | oxygen |
| ox/o | oxygen |
| oxa- | oxygen |
| oxy- | sharp, oxygen |