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LENS

Definition:

[noun] a transparent optical device used to converge or diverge transmitted light and to form images
Synonyms: system
[noun] genus of small erect or climbing herbs with pinnate leaves and small inconspicuous white flowers and small flattened pods: lentils
Synonyms: Lens, genus Lens
[noun] (metaphor) a channel through which something can be seen or understood; "the writer is the lens through which history can be seen"
[noun] biconvex transparent body situated behind the iris in the eye; it focuses light waves on the retina
Synonyms: crystalline
[noun] electronic equipment that uses a magnetic or electric field in order to focus a beam of electrons
Synonyms: electron