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Noun, pl. facets

1. A smooth circumscribed surface. (

1. One member of a compound eye, as found in insects and crustaceans. (

2. Any of the individual units (ommatidia) that make up the compound eye of an insect or crustacean. (Google Dictionary)

Word origin: From French facette (12c., Old French facete), diminutive of face. The diamond-cutting sense is the original one.

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