Hedron means face and is used in combination with a word telling the number of surfaces to describe a specific geometric figure.
An example of hedron is rhombohedron, a crystal with three surfaces.
a geometric figure or crystal having (a specified number of) surfaces: hexahedron
Origin of -hedronClassical Greek -edron from hedra, a side, base, seat from Indo-European base an unverified form sed- from source Classical Latin sedere, sit
A crystal or geometric figure having a specified kind or number of surfaces: heptahedron.
Origin of -hedronNew Latin from Greek -edron from neuter of -edros -sided from hedrā face ; see sed- in Indo-European roots.
- Used in geometry to form the names of solid figures bounded by a certain number of planes (polyhedra).
From Ancient Greek ἕδρα (hedra, “face of a geometrical solid”)