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.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
The American Heritage Dictionary Blog
Check out our blog, updated regularly, for new words and revised definitions, interesting images from the 5th edition, discussions of usage, and more.