| GEOCHRONOLOGIST | • geochronologist n. A geologist whose speciality is geochronology. • GEOCHRONOLOGIST n. one who studies geochronology. |
| GNOTOBIOLOGIES | • GNOTOBIOLOGY n. the study of life in germfree conditions. |
| NEOORTHODOXIES | • NEOORTHODOXY n. reactionaryism. |
| NONCOOPERATION | • noncooperation n. The active absence of cooperation. • non-cooperation n. Alternative spelling of noncooperation. • NONCOOPERATION n. failure or refusal to cooperate. |
| NONCOOPERATIONS | • noncooperations n. Plural of noncooperation. • NONCOOPERATION n. failure or refusal to cooperate. |
| ODONATOLOGIES | • ODONATOLOGY n. the study of dragonflies. |
| ODONTOLOGIES | • ODONTOLOGY n. the study of teeth. |
| ONOMATOLOGIES | • onomatologies n. Plural of onomatology. • ONOMATOLOGY n. the science of names. |
| ONOMATOPOEIA | • onomatopoeia n. (Uncountable) The property of a word of sounding like what it represents. • onomatopoeia n. (Countable) A word that sounds like what it represents, such as "gurgle," "stutter," or "hiss". • onomatopoeia n. (Uncountable, rhetoric) The use of language whose sound imitates that which it names. |
| ONOMATOPOEIAS | • onomatopoeias n. Plural of onomatopoeia. • onomatopœias n. Plural of onomatopœia. • ONOMATOPOEIA n. the naming of a thing or action by a vocal imitation of the sound associated with it, also ONOMATOPOESIS, ONOMATOPOIESIS. |
| ONOMATOPOEIC | • onomatopoeic adj. Of or relating to onomatopoeia. • onomatopoeic adj. Having the property of onomatopoeia. • onomatopœic adj. Alternative spelling of onomatopoeic. |
| ONOMATOPOESIS | • onomatopoesis n. Onomatopoeia. • ONOMATOPOESIS n. onomatopoeia, also ONOMATOPOEIA, ONOMATOPOIESIS. |
| ONOMATOPOETIC | • onomatopoetic adj. (Uncommon) Synonym of onomatopoeic. • ONOMATOPOETIC adj. onomatopoeic. |
| ONOMATOPOIESES | • ONOMATOPOIESIS n. onomatopoeia, also ONOMATOPOEIA, ONOMATOPOESIS. |
| ONOMATOPOIESIS | • onomatopoiesis n. Onomatopoeia. • ONOMATOPOIESIS n. onomatopoeia, also ONOMATOPOEIA, ONOMATOPOESIS. |
| OPISTHOTONOSES | • OPISTHOTONOS n. extreme arching backwards of the spine and neck as a result of spasm of the muscles in that region, etc. |
| OVERPROPORTION | • overproportion v. To give something excessive proportions. • overproportion n. Excessive proportion. • OVERPROPORTION v. to make disproportionately large. |
| OVERPROPORTIONS | • overproportions v. Third-person singular simple present indicative form of overproportion. • OVERPROPORTION v. to make disproportionately large. |
| PERIODONTOLOGY | • periodontology n. (Dentistry) Periodontics. • PERIODONTOLOGY n. the branch of dentistry concerned with periodontal diseases. |
| POGONOTOMIES | • POGONOTOMY n. shaving. |