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A small magnifying glass.
[French, from Old French, flawed gem, probably of Germanic origin.]
(Tools) a magnifying glass used by jewellers, horologists, etc
[C20: from French (formerly an imperfect precious stone), from Old French, of obscure origin]
a magnifying glass used by jewelers and watchmakers, esp. one designed to fit in the eye socket.
[1905–10; < French, orig. an imperfect gem, a mass of hot metal « Germanic; see lob]
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|Noun||1.||loupe - small magnifying glass (usually set in an eyepiece) used by jewelers and horologists|