-hedron

aff. a combining form used in the names of geometrical solid figures having the form or number of faces specified by the initial element:
tetrahedron[/ex]
Etymology: < Gk -edron, neut. of -edros having bases, -sided, der. of hédra seat, face of a geometrical form (cf. cathedra)

From formal English to slang. 2014.

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