loupe

[loop] /lup/
noun
1.
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.
Origin
1905-10; < French, originally an imperfect gem, a mass of hot metal ≪ Germanic; see loop3, lob1
Can be confused
loop, loupe.
Examples from the web for loupe
  • Waters turns it over in his hand, then scrutinizes it under a magnifying loupe.
British Dictionary definitions for loupe

loupe

/luːp/
noun
1.
a magnifying glass used by jewellers, horologists, etc
Word Origin
C20: from French (formerly an imperfect precious stone), from Old French, of obscure origin
Word Origin and History for loupe
n.

"watchmaker's magnifier," 1909, from French loupe.

loupe in Medicine

loupe (lōōp)
n.
A small magnifying lens.