doublet
/ˈdʌblɪt/noun
1
- either of a pair of similar things, in particular either of two words of the same derivation but having different meanings, for example fashion and faction, cloak and clock.成对物之一（尤指一对同源异义词之一, 如fashion 与faction, cloak 与clock）.
1.1
doublets
the same number on two dice thrown at once（一次掷出的）一对同点骰子。
1.2
- Physics & Chemistry a pair of associated lines close together in a spectrum or electrophoretic gel【物理, 化学】（光谱或电泳胶中的）双重线。
1.3
- a combination of two simple lenses双合透镜。
2
- a man's short close-fitting padded jacket, commonly worn from the 14th to the 17th century（14至17世纪男子常穿的）紧身夹克（衫）。
词源
Middle English: from Old French, 'something folded', also denoting a fur-lined coat, from double 'double'.