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WordReference Random House Learner's Dictionary of American English © 2016
cal•o•rie /ˈkæləri/USA pronunciation   n.[countable]pl.  -ries. 
  1. Thermodynamics
    • ThermodynamicsAlso called gram calorie, small calorie. an amount of heat necessary to raise the temperature of one gram of water by one degree celsius.
  2. a unit of measure of the amount of heat or energy that a certain food produces:a diet of 2,000 calories a day.

WordReference Random House Unabridged Dictionary of American English © 2016
cal•o•rie  (kalə rē),USA pronunciation n. 
  1. Thermodynamics
    • ThermodynamicsAlso called  gram calorie, small calorie. an amount of heat exactly equal to 4.1840 joules. Abbr.: cal
    • Thermodynamics(usually cap.) kilocalorie. Abbr.: Cal
  2. Thermodynamics, Physiology[Physiol.]
    • a unit equal to the kilocalorie, used to express the heat output of an organism and the fuel or energy value of food.
    • a quantity of food capable of producing such an amount of energy.
Also,  calory. 
  • Latin calor heat) + -ie -y3
  • French, equivalent. to calor- (
  • 1800–10

Collins Concise English Dictionary © HarperCollins Publishers::

calorie, calory /ˈkælərɪ/ n ( pl -ries)
  1. a unit of heat, equal to 4.1868 joules (International Table calorie): formerly defined as the quantity of heat required to raise the temperature of 1 gram of water by 1°C under standard conditions. It has now largely been replaced by the joule for scientific purposes
    Abbreviation: cal

    Also called: small calorie
Etymology: 19th Century: from French, from Latin calor heat

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