Facet

1. A little face; a small, plane surface; as, the facets of a diamond.
2. To cut facets or small faces upon; as, to facet a diamond.
3. One of the numerous small eyes which make up the compound eyes of insects and crustaceans.
4. A smooth circumscribed surface; as, the articular facet of a bone.
5. The narrow plane surface between flutings of a column.