Definition of lens noun from the Oxford Advanced American Dictionary

     

    lens

     noun
    noun
    NAmE//lɛnz//
     
     
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  1. 1a curved piece of glass or plastic that makes things look larger, smaller, or clearer when you look through it a pair of glasses with tinted lenses a camera with an adjustable lens a lens cap/cover see also fisheye lens, telephoto lens, wide-angle lens, zoom lens
  2. 2(informal) = contact lens Have you got your lenses in?
  3. 3(anatomy) the transparent part of the eye, behind the pupil, that focuses light so that you can see clearly
See the Oxford Advanced Learner's Dictionary entry: lens