| OCTACHORDS | • octachords n. Plural of octachord. • OCTACHORD n. an instrument of eight strings; a system of eight tones. |
| OCTAHEDRAL | • octahedral adj. Having eight plane surfaces; thus, in the shape or form of an octahedron. • octahedral adj. Of, or pertaining to octahedra. • OCTAHEDRAL adj. having eight faces or sides. |
| OCTAHEDRON | • octahedron n. (Geometry) a polyhedron with eight faces; the regular octahedron has regular triangles as faces and… • OCTAHEDRON n. (Greek) a solid bounded by eight plane faces, also OCTOHEDRON. |
| OCTAMEROUS | • octamerous adj. (Biology, zoology) Having parts in groups of eight. • OCTAMEROUS adj. having eight parts or organs. |
| OCTAMETERS | • octameters n. Plural of octameter. • OCTAMETER n. a verse-line of eight feet. |
| OCTANDRIAN | • OCTANDRIAN adj. of or pertaining to the Octandria; having eight distinct stamens, also OCTANDROUS. |
| OCTANDROUS | • octandrous adj. (Botany) Having eight stamens. • OCTANDROUS adj. of or pertaining to the Octandria; having eight distinct stamens, also OCTANDRIAN. |
| OCTANGULAR | • octangular adj. Octagonal, with eight angles. • OCTANGULAR adj. having eight angles. |
| OCTAPLOIDS | • octaploids n. Plural of octaploid. • OCTAPLOID n. a cell, organism or form with eight sets of chromosomes, also OCTOPLOID. |
| OCTAPLOIDY | • octaploidy n. Alternative form of octoploidy. • OCTAPLOIDY n. the condition of being octaploid, eightfold. |
| OCTAPODIES | • octapodies n. Plural of octapody. • OCTAPODY n. in verse, a line of eight feet. |
| OCTARCHIES | • octarchies n. Plural of octarchy. • OCTARCHY n. a government by eight people. |
| OCTASTICHS | • octastichs n. Plural of octastich. • OCTASTICH n. a poem or stanza of eight lines, also OCTASTICHON. |
| OCTASTYLES | • octastyles n. Plural of octastyle. • OCTASTYLE n. an octastyle building, also OCTOSTYLE. |
| OCTAVALENT | • octavalent adj. (Chemistry) Having an atomic valence of 8. • octavalent adj. (Medicine) Having a vaccine valence of 8. • OCTAVALENT adj. having a valency of eight. |