chiliagon (plural chiliagons)
- (geometry) (rare) A polygon with a thousand vertices and a thousand edges.
- 1995: If Kant's claim is just that it is impossible to have a sensory experience of the absence of space, then by contrast it is not impossible to have a sensory experience of a chiliagon. — Lorne Falkenstein, Kant's Intuitionism (Toronto 2004, p. 198)
- The term chiliagon is rarely used in mathematics, the term "1000-gon" being preferred.