Facet n. : A little face; a small, plane surface; as, the facets of a diamond.

Facet n. : A smooth circumscribed surface; as, the articular facet of a bone.

Facet n. : The narrow plane surface between flutings of a column.

Facet n. : One of the numerous small eyes which make up the compound eyes of insects and crustaceans.

Facet v. t. : To cut facets or small faces upon; as, to facet a diamond.

Example:
What would be a good topic to research concerning a Facet of healthcare?

Taxonomy
facet, gemstones, stone, facet cutting, diamond, gem material, brilliant cut, laps, dop, free encyclopedia, diamond cuts, faceting machine, brilliance, mast, cut diamond, index gear, appearance, arrangements.

Defination from the web:
facet arrangements that have been used, the most famous is probably the round brilliant cut, used for diamond and many colored ... often have very large culets, while modern brilliant cut diamonds generally lack the culet facet, or it may be present in minute size. ...