cd
abbreviation
• candela.
Cd
symbol
• the chemical element cadmium.
Cd.
abbreviation
• (in the UK) Command Paper (third series, 1900–18).
CD
noun
• a compact disc.
CD
abbreviation
• civil defence.
• corps diplomatique (diplomatic corps).
cadmium
noun
• the chemical element of atomic number 48, a silvery-white metal.
Origin:
early 19th century: from Latin cadmia ‘calamine’, so named because it is found with calamine in zinc ore. Compare with calamine.
candela
noun
• the SI unit of luminous intensity. One candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 × 1012 Hz and that has a radiant intensity in that direction of 1/683 watt per steradian.
Origin:
1950s: from Latin, ‘candle’.
compact disc
noun
• a small plastic disc on which music or other digital information is stored in the form of a pattern of metal-coated pits from which it can be read using laser light reflected off the disc.
• "all the recordings have been reissued on compact disc"
