LIGHT

n. Lit. Gr., 0w. Lat., lux. Fr., lumiere. Ger., Licht. It., luce. Sp., luz. 1. The physical agency by which the external world is rendered manifest to the sense of sight. According to the undulatory theory of 1.. all space is filled with a rare elastic medium (see ETHER [2d def.]) which a luminous body throws into undulations that affect the eye with the sense of sight. [Brande (F).] 2. A luminous body; an apparatus for producing 1. [a. 17.] Carbon too; U3, blue; U, lull; U4, full; U6, urn; U, like u (German). [s. 637]