facet

Concise Oxford English Dictionary © 2008 Oxford University Press:
facet /ˈfasɪt, -ɛt/

▶noun

• 1 one side of something many-sided, especially of a cut gem.

• 2 an aspect or feature: different facets of the truth.

• 3 Zoology any of the individual units that make up the compound eye of an insect or crustacean.

– derivatives
-faceted adjective.

– origin C17: from Fr. facette, dimin. of face (see face).