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calorie

noun

cal·​o·​rie ˈka-lə-rē How to pronounce calorie (audio)
ˈkal-rē
variants or less commonly calory
plural calories
1
a
: the amount of heat required at a pressure of one atmosphere to raise the temperature of one gram of water one degree Celsius that is equal to about 4.19 joules
abbreviation cal

called also gram calorie, small calorie

b
: the amount of heat required to raise the temperature of one kilogram of water one degree Celsius : 1000 gram calories or 3.968 Btu
abbreviation Cal

called also large calorie

2
a
: a unit equivalent to the large calorie expressing heat-producing or energy-producing value in food when oxidized in the body
b
: an amount of food having an energy-producing value of one large calorie

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