Thermodynamics. Also called gram calorie, small calorie. an amount of heat exactly equal to 4.1840 joules. Abbreviation: cal. (usually initial capital letter) kilocalorie. Abbreviation: Cal.
Physiology. 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.
one thousand small calories. Abbreviation: kcal. Also called Calorie, kilogram calorie, large calorie. Compare calorie (def 1a).
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 It has now largely been replaced by the joule for scientific purposes cal Also called gram calorie, small calorie Compare Calorie