Longman Dictionary of Contemporary English homepage

Date: 1600-1700
Language: Latin
Origin: 'lentil'; because of its shape

lens

noun
     
lens [countable]
1TCP the part of a camera through which the light travels before it reaches the film:
a standard 50mm lens
2DT a piece of curved glass or plastic which makes things look bigger, smaller, or clearer when you look through it:
glasses with powerful lenses
the lens of the microscope
3HBH the clear part inside your eye that focuses so you can see things clearly
4D a contact lens

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