==Properties== This result differs from the area of its circumscribed circle by less than 0.0004%. Because 1000 = 23 × 53, the number of sides is neither a product of distinct Fermat primes nor a power of two. Thus the regular chiliagon is not a constructible polygon. ==Philosophical application== René Descartes uses the chiliagon as an example ...
• (n.) A plane figure of a thousand angles and sides.
Chil'i·a·gon noun [ Greek ...; ... a thousand + ... angle.] A plane figure of a thousand angles and sides. Barlow. 
chiliagon A plane figure of a thousand angles and sides.