| ECTOPROCT | • ectoproct n. (Dated) Synonym of bryozoan. • ECTOPROCT n. a bryozoan, a moss or liverwort. |
| ENTOPROCT | • entoproct n. (Zoology) Any member of the phylum Entoprocta, mostly sessile aquatic animals. • ENTOPROCT n. any of a phylum of animals related to Bryozoans. |
| OPTOMETER | • optometer n. An instrument for measuring the focus of the lens of the eye. • OPTOMETER n. an instrument for testing vision. |
| OPTOMETRY | • optometry n. The art and science of vision and eye care. • OPTOMETRY n. the science of vision and eye-care. |
| ORTHOPTER | • orthopter n. Any insect of the order Orthoptera. • orthopter n. Synonym of ornithopter. • ORTHOPTER n. a type of aircraft propelled with flapping wings. |
| OUTPORTER | • OUTPORTER n. (Canadian) an inhabitant or native of a Newfoundland outport. |
| POTOMETER | • potometer n. A device used for measuring the rate of water uptake of a leafy shoot due to photosynthesis and transpiration. • POTOMETER n. an instrument measuring the rate at which plants absorb water. |
| PROTECTOR | • protector n. Someone who protects or guards, by assignment or on their own initiative. • protector n. A device or mechanism which is designed to protect. • protector n. One who prevents interference. (Can we add an example for this sense?) |
| PROTESTOR | • protestor n. Alternative spelling of protester. • PROTESTOR n. one who protests, also PROTESTER. |
| PROTONATE | • protonate v. (Chemistry, transitive) To add one or more protons to (a molecule, ion or radical). • protonate v. (Chemistry, intransitive) To acquire an additional proton. • PROTONATE v. to acquire an additional proton. |
| PROTOTYPE | • prototype n. An original form or object which is a basis for other forms or objects (particularly manufactured items)… • prototype n. An early sample or model built to test a concept or process. • prototype n. (Computing) A declaration of a function that specifies the name, return type, and parameters, but none… |
| TAPROOTED | • taprooted adj. Having taproots. • TAPROOTED adj. having a taproot. |
| TOPOMETRY | • topometry n. (Chiefly medicine) Any of various imaging or surveying techniques in which the three-dimensional positions… • TOPOMETRY n. the measurement of the surface features of a region. |
| VAPORETTO | • vaporetto n. A public water bus, originally steam-powered, found especially in Venice. • VAPORETTO n. (Italian) a motorboat serving as a canal bus in Venice. |