1 : a digitally encoded recording on an optical disk that is smaller than a phonograph record; played back by a laser
2 : a soft bluish-white ductile malleable toxic bivalent metallic element; occurs in association with zinc ores
3 : the basic unit of luminous intensity adopted under the Systeme International d'Unites; equal to 1/60 of the luminous intensity per square centimeter of a black body radiating at the temperature of 2,046 degrees Kelvin
