calories

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WordReference Random House Learner's Dictionary of American English © 2016
cal•o•rie /ˈkæləri/USA pronunciation  n. [countable],pl. -ries. 
  • 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), 
    n. 
      [Thermodynam.]
        • Also called gram calorie, small calorie. an amount of heat exactly equal to 4.1840 joules. Abbr.: cal
        • (usually cap.) kilocalorie. Abbr.: Cal
      [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. 
      Etymology:
      • 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 It has now largely been replaced by the joule for scientific purposes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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