'loupe' definitions:

Definition of 'loupe'

From: WordNet
noun
Small magnifying glass (usually set in an eyepiece) used by jewelers and horologists [syn: loupe, jeweler's loupe]

Definition of 'loupe'

From: GCIDE
  • loupe \loupe\ (l[=oo]p), n. Any of a variety of small magnifying glasses, having a magnifying power from 2X to 20X, commonly of 10X, which may be held in the hand, or in some cases held within the eyesocket without the use of a hand. It is commonly used by jewelers and watchmakers. [PJC]