Search Result for "octagon": 
Wordnet 3.0

NOUN (1)

1. an eight-sided polygon;


The Collaborative International Dictionary of English v.0.48:

Octagon \Oc"ta*gon\, n. [Gr. ? eight-cornered; 'okta- (for 'oktw` eight) + ? an angle: cf. F. cctogone.] 1. (Geom.) A plane figure of eight sides and eight angles. [1913 Webster] 2. Any structure (as a fortification) or place with eight sides or angles. [1913 Webster] Regular octagon, one in which the sides are all equal, and the angles also are all equal. [1913 Webster]
WordNet (r) 3.0 (2006):

octagon n 1: an eight-sided polygon