any of several varieties of magnifying glasses, used by jewelers and watchmakers, of from 2 to 20 power and intended to fit in the eye socket, to be attached to spectacles, or to be held in the hand.

1905–10; < French, originally an imperfect gem, a mass of hot metal ≪ Germanic; see loop3, lob1

loop, loupe.
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World English Dictionary
loupe (luːp)
a magnifying glass used by jewellers, horologists, etc
[C20: from French (formerly an imperfect precious stone), from Old French, of obscure origin]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

"watchmaker's magnifier," 1909, from Fr. loupe.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

loupe (lōōp)
A small magnifying lens.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Waters turns it over in his hand, then scrutinizes it under a magnifying loupe.
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