What is "chiliagon"

Chiliagon \Chil"i*a*gon\, n. [Gr. ?; chi`lioi a thousand + ? angle.] A plane figure of a thousand angles and sides.
--Barlow.

n. (context geometry English) (''rare'') A polygon with a thousand vertex and a thousand edges.

In geometry, a chiliagon (pronounced ) or 1000-gon is a polygon with 1000 sides. Several philosophers have used it to illustrate issues regarding thought.