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octagonal
THESAURUS
octagonal
decagonal, dodecagonal, dodecahedral, eightfold, eighth, heptagonal, hexagonal, hexahedral, icosahedral, octadic, octahedral, octal, octan, octaploid, octastyle, octofid, octonary, octosyllabic, octuple, pentagonal, pentahedralFor further exploring for "octagonal" in Webster Dictionary Online