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lens

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lens/ˈlɛnz/noun
plurallenses
lens
/ˈlɛnz/
noun
plurallenses
Learner's definition of LENS  
[count]
: a clear curved piece of glass or plastic that is used in eyeglasses, cameras, telescopes, etc., to make things look clearer, smaller, or bigger
: the clear part of the eye that focuses light to form clear images
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