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Word Parts Beginning With O
22 word parts in the Medical Terminology guide begin with the letter O — prefixes, word roots and suffixes together. Every entry links to its own page with worked examples.
A B C D E F G H I J K L M N O P Q R S T U V X Z
| Word part | Type | Meaning |
|---|---|---|
| octa- | Prefix | eight |
| ocul | Word root | eye |
| -oid | Suffix | resembling |
| olig- | Prefix | few, scanty, little |
| -ologist | Suffix | specialist in the study of |
| -ology | Suffix | study of |
| -oma | Suffix | tumor; mass |
| onc | Word root | tumor; mass |
| oophor | Word root | ovary |
| ophthalm | Word root | eye |
| -opia | Suffix | vision condition |
| opt | Word root | vision, eye |
| -orexia | Suffix | appetite |
| ortho- | Prefix | straight, correct, upright |
| -osis | Suffix | abnormal condition; increase |
| -osmia | Suffix | smell; sense of smell |
| ossicul | Word root | small bone, ear ossicle |
| oste | Word root | bone |
| -ostomy | Suffix | surgical creation of an opening |
| ot | Word root | ear |
| -otomy | Suffix | surgical incision; cutting into |
| ox | Word root | oxygen |
Please note: This section teaches the language of medicine — what word parts mean and how terms are built. It is an educational reference, not medical advice. For the meaning of a word in your own medical record, ask the clinician who wrote it.