Fac·et n.
1. A little face; a small, plane surface; as, the facets of a diamond. [Written also facette.]
2. Anat. A smooth circumscribed surface; as, the articular facet of a bone.
3. Arch. The narrow plane surface between flutings of a column.
4. Zool. One of the numerous small eyes which make up the compound eyes of insects and crustaceans.