Also found in: Medical.
A crystal or geometric figure having a specified kind or number of surfaces: heptahedron.
n combining form
(Mathematics) indicating a geometric solid having a specified number of faces or surfaces: tetrahedron.
[from Greek -edron -sided, from hedra seat, base]
-hedral adj combining form
a combining form 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, derivative of hédra seat, face of a geometrical form (compare cathedra)]