Definition of optical
1
: of or relating to the science of optics
2a
: of or relating to vision : visual
b
: visible sense 1
optical wavelength
c
: of, relating to, or being objects that emit light in the visible range of frequencies
an optical galaxy
d
: using the properties of light to aid vision
an optical instrument
3a
: of, relating to, or utilizing light especially instead of other forms of energy
optical microscopy
b
: involving the use of light-sensitive devices to acquire information for a computer
optical character recognition
4
: of or relating to optical art
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Merriam-Webster unabridged
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Time Traveler for optical
The first known use of optical was in 1570
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