Main Entry: dou·blet

Pronunciation: \ˈdəb-lət\

Function: noun

Etymology: Middle English, from Anglo-French dublet, from duble

Date: 14th century

1 : a man's close-fitting jacket worn in Europe especially during the Renaissance
2 : something consisting of two identical or similar parts: as a : a lens consisting of two components; especially : 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; specifically : one of two or more words (as guard and ward) in the same language derived by different routes of transmission from the same source

[doublet illustration]