facet (n.)youdaoicibaDictYouDict[facet 词源字典]
1620s, "one side of a multi-sided body," from French facette (12c., Old French facete), diminutive of face "face, appearance" (see face (n.)). The diamond-cutting sense is the original one. Transferred and figurative use by 1820. Related: Faceted; facets.[facet etymology, facet origin, 英语词源]