A geometric shape or structure with 600 faces, related to or resembling a 600-faced polyhedron.
From 'hexacosi-' (six hundred) from Greek 'hexakosioi' plus '-hedron' from Greek 'hedra' (face) plus '-oid' (resembling). This geometric term appears in advanced mathematics.
Imagine trying to describe a shape with 600 faces—you'd need math to even visualize it, so mathematicians just borrowed Greek numbers and put 'face' on the end, creating a word for something that barely exists outside equations.
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