| COLEOPTERON | • COLEOPTERON n. a large order of insects having the front wings modified as hard wing-cases, and comprising the beetles and weevils, also COLEOPTERAN. |
| COOPERATION | • cooperation n. (Usually uncountable) The act of cooperating. • cooperation n. Active help from a person, organization, etc., such as an orderly sharing of space or resources. • cooperation n. Association for mutual benefit, such as for purposes of production or purchase. |
| IONOTROPIES | • IONOTROPY n. the reversible interconversion of a pair of organic isomers. |
| MONOSTROPHE | • monostrophe n. A metrical composition having a single strophe. • MONOSTROPHE n. a poem in which all the stanzas or strophes are written in the same metre. |
| ODONTOPHORE | • odontophore n. A projection in the mouths of most molluscs, used with the radula to break up food. • ODONTOPHORE n. the rasping apparatus in molluscs. |
| ORTHOPNOEAS | • orthopnoeas n. Plural of orthopnoea. • ORTHOPNOEA n. the ability to breathe in an upright position only. |
| ORTHOPTERON | • orthopteron n. Alternative form of orthopteran. • ORTHOPTERON n. any member of the Orthoptera, an order of mandibulate insects, also ORTHOPTERAN. |
| PHOTOIONISE | • PHOTOIONISE v. to ionize by electromagnetic radiation, also PHOTOIONIZE. |
| PHOTOIONIZE | • photoionize v. (Physics) To cause, or to undergo photoionization. • PHOTOIONIZE v. to ionize by electromagnetic radiation, also PHOTOIONISE. |
| PHOTONOVELS | • photonovels n. Plural of photonovel. • PHOTONOVEL n. a novel in the form of a series of photographs with speech balloons. |
| PHOTOPHONES | • photophones n. Plural of photophone. • PHOTOPHONE n. an apparatus for the production of sound by the action of rays of light. |
| PHOTOSENSOR | • photosensor n. A photodetector. • PHOTOSENSOR n. a detector that is sensitive to electromagnetic radiation. |
| POLTROONERY | • poltroonery n. Cowardice; lack of spirit; pusillanimity. • POLTROONERY n. mean pusillanimity, cowardice. |
| POTAMOGETON | • potamogeton n. (Botany) Any of the plants of the genus Potamogeton. • Potamogeton prop.n. A taxonomic genus within the family Potamogetonaceae – pondweeds. • POTAMOGETON n. a plant of the pondweed genus of water plants, with floating and submerged leaves. |
| POULTROONES | • POULTROONE n. (Shakespeare) a poltroon, also POLTROON. |