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candela

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can⋅de⋅la

[kan-dee-luh]
–noun Optics.
a unit of luminous intensity, defined as the luminous intensity of a source that emits monochromatic radiation of frequency 540 × 1012 hertz and that has a radiant intensity of 1/683 watt/steradian: adopted in 1979 as the international standard of luminous intensity. Abbreviation: Cd

Origin:
1945–50; < L: candle
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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can·del·a   (kān-děl'ə)   
n.   Abbr. cd
A unit of luminous intensity equal to 1/60 of the luminous intensity per square centimeter of a blackbody radiating at the temperature of solidification of platinum (2,046°K). Also called candle. See Table at measurement.

[Latin candēla, candle; see candle.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Medical Dictionary

Main Entry: can·de·la
Pronunciation: kan-'dE-l&, -'del-&
Function: noun
: the base unit of luminous intensity in the InternationalSystem of Units that is equal to the luminous intensity in a given direction of a source which emits monochromatic radiation of frequency 540 × 1012hertz and has a radiant intensity inthat direction of 1/683 watt per unit solid angle —abbreviation cd; called also candle
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

candela can·del·a (kān-děl'ə)
n.
Abbr. cd
A unit of measurement of luminous flux, equal to the amount of light given out through a solid angle by a source of one candela radiating equally in all directions. Also called candle.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Science Dictionary
candela   (kān-děl'ə)  Pronunciation Key 
The SI unit used to measure the brightness of a source of light (its luminous intensity). By definition, one square centimeter of a blackbody at the freezing point of platinum emits one-sixtieth of a candela of radiation. See Table at measurement. See also lumen, luminous flux.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia

candela

unit of luminous intensity in the International System of Units (SI), defined as the luminous intensity in a given direction of a source that emits monochromatic radiation of frequency 540 1012 hertz and has a radiant intensity in that same direction of 1683 watt per steradian (unit solid angle). The candela has replaced the standard candle or lamp as a unit of luminous intensity in calculations involving artificial lighting and is sometimes called the "new candle."

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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