a combining form meaning “face,” used in the names of geometrical solid figures having the form or number of faces specified by the initial element: tetrahedron.

< Greek -edron, neuter of -edros having bases, -sided, equivalent to (h)édr(a) seat, face of a geometrical form (see cathedra) + -os adj. suffix

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World English Dictionary
n combining form
indicating a geometric solid having a specified number of faces or surfaces: tetrahedron
[from Greek -edron -sided, from hedra seat, base]
adj combining form

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