| Word | Definitions | Synonyms |
|---|---|---|
| oboe | (noun) a slender double-reed instrument; a woodwind with a conical bore and a double-reed mouthpiece | Synonyms: hautbois, hautboy |
| oboist | (noun) a musician who plays the oboe | - |
| obolus | (noun) a Greek unit of weight equal to one tenth of a gram | - |
| obovate | (adjective) (of a leaf shape) egg-shaped with the narrower end at the base | - |