A polyhedron or geometric solid with one thousand faces or surfaces.
From Greek 'khiliás' (thousand) + 'hedron' (face, side). This is a variant or alternate form of 'chiliadron,' using a different Greek combining form to express the same mathematical concept.
The existence of both 'chiliadron' and 'chiliaedron' for the same object shows how mathematical terminology isn't always standardized—mathematicians sometimes coin multiple terms, and whichever gets used in influential publications wins out, making scientific language somewhat arbitrary.
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