cd (Adjective) — Being one hundred more than three hundred.
cd (Noun) — The basic unit of luminous intensity adopted under the Systeme International d'Unites; equal to 1/60 of the luminous intensity per square centimetre of a black body radiating at the temperature of 2,046 degrees Kelvin.
cd (Noun) — A digitally encoded recording on an optical disk that is smaller than a phonograph record; played back by a laser.
cd (Noun) — A debt instrument issued by a bank; usually pays interest.
cd (Noun) — A soft bluish-white ductile malleable toxic bivalent metallic element; occurs in association with zinc ores.