a person or thing that magnifies.
a lens or combination of lenses that magnifies an object; magnifying glass.

1540–50; magnify + -er1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
magnifying glass or magnifier
a convex lens used to produce an enlarged image of an object
magnifier or magnifier

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
So the banking system is not acting as a magnifier of recession.
Our pocket-size magnifier and light is the ideal travel tool for consulting
  maps, menus, or guidebooks in low light.
The direct view system is a low power magnifier with a scaled reticle in its
  object plane.
Binoculars and a pocket magnifier let you peer into the natural world.
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