[hep.ta.gon] n [Gk heptagonos heptagonal, fr. hepta + gonia angle--more at -gon] (1570): a polygon of seven angles and seven sides -- hep.tag.o.nal adj
HEPTAGON
Meaning of HEPTAGON in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012