Webster's English Dictionary

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doublet

dou.blet \'d*b-l*t\ n [ME, fr. MF, fr. double] 1: a man's close-fitting 
   jacket worn in Europe esp. during the Renaissance  2a1: something 
   consisting of two identical or similar parts  2a2: a set of two identical 
   or similar things; specif : two thrown  dice with the same number of spots 
   on the upper face 2b: one of a pair; specif : one of two or more words (as 
   guardX and ward) in the same language derived by different routes of 
   transmission from the same source