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lens

 
 
pronunciation:
lenz
part of speech: noun
inflections: lenses
definition 1: a piece of clear material such as glass that bends light rays passing through it. The surface of a lens is curved to bend light rays toward or away from a central point.
If your eyesight gets worse, you will need new, stronger lenses for your glasses.
definition 2: a number of such pieces connected together in a camera or telescope.
 
definition 3: a clear part of the eye that brings together the rays of light needed for sight. The lens focuses rays of light so that they form an image inside the eye on the retina.