/ ˈɒptɪk; NAmE ˈɑːp-/ adjective , noun
■ adjective
[ usually before noun ] ( technical ) connected with the eye or the sense of sight :
the optic nerve (= from the eye to the brain)
■ noun
a device for measuring amounts of strong alcoholic drinks in a bar
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WORD ORIGIN
late Middle English : from French optique or medieval Latin opticus , from Greek optikos , from optos seen.