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optical

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The definition of optical is having to do with sight or light.

(adjective)

An example of optical used as an adjective is in the phrase "optical illusion," which means an illusion that tricks the eyes.

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See optical in Webster's New World College Dictionary

adjective

of or connected with the sense of sight; visual; ocular
of the relation between light and vision
having to do with optics
for aiding vision

Related Forms:

optically adverb

See optical in American Heritage Dictionary 4

adjective

Of or relating to sight; visual: an optical defect.
Designed to assist sight: optical instruments.
Of or relating to optics.
Relating to or using visible light: optical astronomy.
Using light-sensitive devices.

Related Forms:

opˈti·cal·ly adverb

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