| ECTOPROCTS | • ectoprocts n. Plural of ectoproct. • ECTOPROCT n. a bryozoan, a moss or liverwort. |
| ENTOPROCTS | • entoprocts n. Plural of entoproct. • ENTOPROCT n. any of a phylum of animals related to Bryozoans. |
| OPTOMETERS | • optometers n. Plural of optometer. • OPTOMETER n. an instrument for testing vision. |
| ORTHOEPIST | • orthoepist n. An expert at orthoepy: a person who studies the pronunciation of words, especially (historical) one… • orthoëpist n. Archaic spelling of orthoepist. • ORTHOEPIST n. one who is skilled in orthoepy. |
| ORTHOPTERS | • orthopters n. Plural of orthopter. • ORTHOPTER n. a type of aircraft propelled with flapping wings. |
| OUTPORTERS | • OUTPORTER n. (Canadian) an inhabitant or native of a Newfoundland outport. |
| OUTSPORTED | • outsported v. Simple past tense and past participle of outsport. • OUTSPORT v. (Shakespeare) to sport beyond the limits of. |
| PORTENTOUS | • portentous adj. Of momentous or ominous significance. • portentous adj. Ominously prophetic. • portentous adj. Puffed up with vanity. |
| POSTMORTEM | • postmortem n. Alternative spelling of post mortem. • post-mortem adj. Alternative spelling of post mortem. • post-mortem n. Alternative spelling of post mortem. |
| POTOMETERS | • potometers n. Plural of potometer. • POTOMETER n. an instrument measuring the rate at which plants absorb water. |
| PROTECTORS | • protectors n. Plural of protector. • PROTECTOR n. one who protects, also PROTECTER. |
| PROTESTORS | • protestors n. Plural of protestor. • PROTESTOR n. one who protests, also PROTESTER. |
| PROTONATES | • protonates v. Third-person singular simple present indicative form of protonate. • PROTONATE v. to acquire an additional proton. |
| PROTOSTELE | • protostele n. (Botany) A type of stele, in which the vascular tissue in the stem forms a solid core, with no central… • PROTOSTELE n. a stele in which the vascular tissue forms a solid core, with centrally placed xylem surrounded by phloem. |
| PROTOSTOME | • protostome n. Any animal, of the taxon Protostomia, in which the mouth is derived from the embryonic blastopore. • PROTOSTOME n. a major group of bilateral metazoan animals, that includes mollusks and annelids. |
| PROTOTYPES | • prototypes n. Plural of prototype. • PROTOTYPE v. to make a prototype. |
| STREPITOSO | • STREPITOSO adv. (Italian) noisy, boisterous. |
| TORPEDOIST | • torpedoist n. One skilled in the theory or use of naval torpedoes. • torpedoist n. One who favours the use of torpedoes. • TORPEDOIST n. one whose job is to fire torpedoes. |
| TROPOTAXES | • tropotaxes n. Plural of tropotaxis. • TROPOTAXIS n. a taxis in which an organism orients itself by the simultaneous comparison of stimuli of different intensity operating on different end organs. |
| VAPORETTOS | • vaporettos n. Plural of vaporetto. • VAPORETTO n. (Italian) a motorboat serving as a canal bus in Venice. |