( n. )
One of the component elements of the total radiation from a body; any definite or limited portion of the spectrum; as, the red ray; the violet ray. See Illust. under Light.
( n. )
One of the component elements of the total radiation from a body; any definite or limited portion of the spectrum; as, the red ray; the violet ray. See Illust. under Light.
Webster's Revised Unabridged English Dictionary. Пересмотренный полный словарь английского языка Webster. 2012