octagon Meaning, Definition & Usage

  1. noun an eight-sided polygon

WordNet

Oc"ta*gon noun
Etymology
Gr. eight-cornered; (for eight) + an angle: cf.F. cctogone.
Definitions
  1. (Geom.) A plane figure of eight sides and eight angles.
  2. Any structure (as a fortification) or place with eight sides or angles.

Webster 1913