What is "hendecagon"

Hendecagon \Hen*dec"a*gon\, n. [Gr. ? eleven + ? angle: cf. F. hend['e]cagone.] (Geom.) A plane figure of eleven sides and eleven angles. [Written also endecagon.]

n. (context geometry English) a polygon with eleven edges and eleven angles.

In geometry, a hendecagon (also undecagon or endecagon) or 11-gon is an eleven-sided polygon. (The name hendecagon, from Greek hendeka "eleven" and gon– "corner", is often preferred to the hybrid undecagon, whose first part is formed from Latin undecim "eleven".)