| Octagon 1. (n.) A plane figure of eight sides and eight angles. 2. (n.) Any structure (as a fortification) or place with eight sides or angles. Thesaurus Entries Octateuch, cast, company, complement, crew, eighter from Decatur, eleven, first string, first team, five, nine, octad, octagon, octahedron, octameter, octastyle, octave, octavo, octet, octonary, octosyllable, ogdoad, platoon, reserves, rowing crew, second string, second team, squad, string, team, third string, utas, varsity |