Medical Dictionary


noun \ˈlīt\

Medical Definition of LIGHT

a :  the sensation aroused by stimulation of the visual receptors b :  an electromagnetic radiation in the wavelength range including infrared, visible, ultraviolet, and X-rays and traveling in a vacuum with a speed of about 186,281 miles (300,000 kilometers) per second; specifically :  the part of this range that is visible to the human eye
:  a source of light
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