Definitions
from The Century Dictionary.
 noun A plane figure of a thousand angles and sides.
from the GNU version of the Collaborative International Dictionary of English.
 noun A plane figure of a thousand angles and sides.
from Wiktionary, Creative Commons Attribution/ShareAlike License.
 noun geometry (rare) A
polygon with a thousandvertices and a thousandedges .
Etymologies
from Wiktionary, Creative Commons Attribution/ShareAlike License
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Examples

Also, there were things such as Descartes 'chiliagon which, while they could be represented physically, could not (as experience shows) be represented accurately by our physical imaging system.
Sticky Wants to Grab 2009

When we think of a perfect triangle, or a chiliagon, or even of some possible animal not actually existent, the object of our thought, the objective concept, is a possible essence.
Descartes' Theory of Ideas Pessin, Andrew 2007

'Tis impossible for the eye to determine the angles of a chiliagon to be equal to 1996 right angles, or make any conjecture, that approaches this proportion; but when it determines, that right lines cannot concur; that we cannot draw more than one right line between two given points; it's mistakes can never be of any consequence.

a chiliagon to be equal to 1996 right angles, or make any conjecture, that approaches this proportion; but when it determines, that right lines cannot concur; that we cannot draw more than one right line between two given points; it's mistakes can never be of any consequence.
A Treatise of Human Nature David Hume 1743

It is impossible for the eye to determine the angles of a chiliagon to be equal to 1996 right angles, or make any conjecture, that approaches this proportion; but when it determines, that right lines cannot concur; that we cannot draw more than one right line between two given points; it’s mistakes can never be of any consequence.
bilby commented on the word chiliagon
A multihabanerosided figure.
November 25, 2009
qms commented on the word chiliagon
There’s many a line to be drawn
To finish my chiliagon.
With pencils and rules
And paper my tools
With patience I’ll see you anon.
June 18, 2018