| MOTORMOUTHS | • motormouths n. Plural of motormouth. • motor-mouths n. Plural of motor-mouth. • motor␣mouths n. Plural of motor mouth. |
| OCTOTHORPES | • octothorpes n. Plural of octothorpe. |
| ORTHOBORATE | • orthoborate n. (Inorganic chemistry) Any anion derived from orthoboric acid; any salt containing this anion. • ORTHOBORATE n. a salt of orthoboric acid. |
| ORTHODONTIA | • orthodontia n. Synonym of orthodontics. • ORTHODONTIA n. the rectification of crookedness in the teeth, also ORTHODONTICS. |
| ORTHODONTIC | • orthodontic adj. Of, or relating to the dental speciality of orthodontics. • ORTHODONTIC adj. relating to orthodontics, the rectification of crookedness in the teeth. |
| ORTHOPTERON | • orthopteron n. Alternative form of orthopteran. • ORTHOPTERON n. any member of the Orthoptera, an order of mandibulate insects, also ORTHOPTERAN. |
| ORTHOTROPIC | • orthotropic adj. (Botany) Growing vertically, either upwards or downwards. • orthotropic adj. (Engineering) Having material properties that differ along three mutually orthogonal twofold axes of… • ORTHOTROPIC adj. growing along a vertical axis. |
| PHOTOTROPES | • PHOTOTROPE n. a substance exhibiting phototropism, movement directed by light. |
| PHOTOTROPHS | • phototrophs n. Plural of phototroph. • PHOTOTROPH n. a plant which uses light to generate energy needed to absorb nutrients. |
| PHOTOTROPIC | • phototropic adj. Having a tendency to move in response to light. An animal or microbe that is positively phototropic… • PHOTOTROPIC adj. relating to phototropism, movement directed by light. |
| PROTOTROPHS | • prototrophs n. Plural of prototroph. • PROTOTROPH n. a bacterium feeding only on inorganic matter. |
| PROTOTROPHY | • prototrophy n. The condition of being a prototroph. • PROTOTROPHY n. the state of being prototrophic. |
| THERMOMOTOR | • THERMOMOTOR n. an engine that produces force from the expansion of a heated fluid. |
| THORACOTOMY | • thoracotomy n. (Surgery) The surgical procedure of making an incision into the chest, normally as a first step to gain… • THORACOTOMY n. surgical incision of the chest wall. |
| TRAITORHOOD | • traitorhood n. The quality of being a traitor. • TRAITORHOOD n. the state of being a traitor. |
| TROCHOTRONS | • TROCHOTRON n. a trochoidal magnetron, high-frequency counting tube which deflects a beam on to radially disposed electrodes. |
| TROPHOZOITE | • trophozoite n. A protozoan in the feeding stage of its life cycle. • TROPHOZOITE n. in Protozoa, the trophic phase of an adult. |