"lens" in the noun sense
1. lens, lense, lens system
a transparent optical device used to converge or diverge transmitted light and to form images
2. Lens, genus Lens
genus of small erect or climbing herbs with pinnate leaves and small inconspicuous white flowers and small flattened pods: lentils
3. lens
metaphor) a channel through which something can be seen or understood
"the writer is the lens through which history can be seen"
4. lens, crystalline lens, lens of the eye
biconvex transparent body situated behind the iris in the eye its role (along with the cornea) is to focus light on the retina
5. lens, electron lens
electronic equipment that uses a magnetic or electric field in order to focus a beam of electrons
Source: WordNet® (An amazing lexical database of English)
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