fac·et 
(făsĭt)
(făsĭt)n.
1. One of the flat polished surfaces cut on a gemstone or occurring naturally on a crystal.
2. Anatomy A small, smooth, flat surface, as on a bone or tooth.
3. Biology One of the lenslike visual units of a compound eye, as of an insect.
4. One of numerous aspects, as of a subject.
[French facette, from Old French, diminutive of face, face; see FACE.]
facet·ed, facet·ted adj.