[dou.blet] n [ME, fr. MF, fr. double] (14c) 1: a man's close-fitting jacket worn in Europe esp. during the Renaissance
2: something consisting of two identical or similar parts: as a: a lens consisting of two components; esp: a handheld magnifier consisting of two lenses in a metal cylinder b: a spectrum line having two close components c: a domino with the same number of spots on each end
3: a set of two identical or similar things: as a: two thrown dice with the same number of spots on the upper face b: one of nine pairs of microtubules found in cilia and flagella
4: one of a pair; specif: one of two or more words (as guard and ward) in the same language derived by different routes of transmission from the same source