| ODALISQUES | • odalisques n. Plural of odalisque. • ODALISQUE n. (French) a female slave; a concubine in a harem, also ODALIQUE, ODALISK. |
| ODDSMAKERS | • oddsmakers n. Plural of oddsmaker. • ODDSMAKER n. one who figures odds. |
| ODIOUSNESS | • odiousness n. (Uncountable) The condition of being odious. • odiousness n. (Countable) An odious thing. • ODIOUSNESS n. the state of being odious. |
| ODOMETRIES | • ODOMETRY n. the process of using an odometer. |
| ODONATISTS | • odonatists n. Plural of odonatist. • ODONATIST n. an expert on dragonflies. |
| ODONTALGIA | • odontalgia n. (Medicine) toothache. • ODONTALGIA n. toothache, also ODONTALGY. |
| ODONTALGIC | • odontalgic adj. Of or pertaining to odontalgia. • odontalgic n. A toothache remedy. • ODONTALGIC adj. of or pertaining to odontalgia, toothache. |
| ODONTOCETE | • odontocete n. (Zoology) Any member of the cetacean suborder Odontoceti; a toothed whale. • ODONTOCETE n. a subdivision of Cetacea, including the sperm whale, dolphins, etc.; the toothed whales. |
| ODONTOGENY | • odontogeny n. (Biology) The generation, or mode of development, of the teeth. • ODONTOGENY n. the origin and development of teeth. |
| ODONTOLITE | • odontolite n. (Mineralogy) A fossil tooth coloured a bright blue by iron phosphate, used as an imitation turquoise. • ODONTOLITE n. a fossil bone or tooth coloured blue with phosphate of iron, aka bone-turquoise. |
| ODONTOLOGY | • odontology n. The study of the structure and development of teeth. • odontology n. The branch of dentistry dealing with abnormalities of teeth. • ODONTOLOGY n. the study of teeth. |
| ODONTOMATA | • odontomata n. Plural of odontoma. • ODONTOMA n. a tooth tumour. |
| ODORIMETRY | • odorimetry n. The measurement of odor. • ODORIMETRY n. the measurement of the strength and persistence of odours. |
| ODORIPHORE | • ODORIPHORE n. the group of atoms in an odorous molecule responsible for its odour. |