plural of OPI

(military, government) Initialism of office of primary interest.

A surname from Cornish.

plural of Opie

(nonstandard) plural of magnum opus

(Greek architecture) A porch at the rear of a temple, set against the blank back wall of the cella.

(biology) Any of very many eukaryotes, including animals and fungi, whose flagellate cells (if any) propel themselves with a single posterior flagellum.

plural of opisthokont

(historical) Any early document (such as a roll of papyrus) that has writing on the back as well as the front. / (historical) Any early book that has letterpress printing on both sides of the page.

plural of opisthograph