| Octagonal (a.) Having eight sides and eight angles. Thesaurus Entries decagonal, dodecagonal, dodecahedral, eightfold, eighth, heptagonal, hexagonal, hexahedral, icosahedral, octadic, octahedral, octal, octan, octaploid, octastyle, octofid, octonary, octosyllabic, octuple, pentagonal, pentahedral |