| DEMONSTRATOR | • demonstrator n. One who demonstrates anything, or proves beyond doubt. • demonstrator n. The forefinger. • demonstrator n. One who takes part in a demonstration; a protester. |
| HYDROMETEORS | • hydrometeors n. Plural of hydrometeor. • HYDROMETEOR n. a general term for the aqueous phenomena of the atmosphere, as rain, snow, sleet, hail. |
| HYDROTROPISM | • hydrotropism n. (Biology) The movement of a plant (or other organism) in response to water, either towards or away from water. • HYDROTROPISM n. growth in the direction of water. |
| MORTARBOARDS | • mortarboards n. Plural of mortarboard. • MORTARBOARD n. a square-topped college cap. |
| MOTHERBOARDS | • motherboards n. Plural of motherboard. • MOTHERBOARD n. the board containing the main circuits of an electronic device, especially in computers. |
| MOUTHBROODER | • mouthbrooder n. (Zoology) Any animal that cares for its offspring, either eggs or juveniles, by holding them in its… • MOUTHBROODER n. a cichlid fish that carries its young in its mouth for protection, also MOUTHBREEDER. |
| ODORIMETRIES | • ODORIMETRY n. the measurement of the strength and persistence of odours. |
| ORTHODROMICS | • orthodromics n. Orthodromic navigation. • ORTHODROMICS n. the act or art of sailing on a great circle, also ORTHODROMY. |
| ORTHODROMIES | • ORTHODROMY n. the act or art of sailing on a great circle, also ORTHODROMICS. |
| OSTRACODERMS | • ostracoderms n. Plural of ostracoderm. • OSTRACODERM n. any of the early fossil jawless fishes of the Lower Paleozoic usually having a bony covering of plates or scales. |
| OUTPERFORMED | • outperformed v. Simple past tense and past participle of outperform. • OUTPERFORM v. to exceed in performance. |
| OVERPROMOTED | • overpromoted v. Simple past tense and past participle of overpromote. • OVERPROMOTE v. to promote excessively. |
| PREDOMINATOR | • predominator n. One who predominates. • PREDOMINATOR n. one who predominates. |
| RADIOTHORIUM | • radiothorium n. (Physics) The radioactive isotope thorium-228. • RADIOTHORIUM n. a radioactive isotope of thorium with the mass number 228. |
| RODOMONTADER | • RODOMONTADER n. a braggart, a blusterer. |
| THERMOFORMED | • thermoformed v. Simple past tense and past participle of thermoform. • THERMOFORM v. to give a final shape to plastics by heat and pressure. |