calorie

[kal-uh-ree]
noun
1.
Thermodynamics.
a.
Also called gram calorie, small calorie. an amount of heat exactly equal to 4.1840 joules. Abbreviation: cal
b.
(usually initial capital letter) kilocalorie. Abbreviation: Cal
2.
Physiology.
a.
a unit equal to the kilocalorie, used to express the heat output of an organism and the fuel or energy value of food.
b.
a quantity of food capable of producing such an amount of energy.
Also, calory.


Origin:
1800–10; < French, equivalent to calor- (< Latin calor heat) + -ie -y3

Dictionary.com Unabridged

calory

[kal-uh-ree]
noun, plural calories.

kilocalorie

[kil-uh-kal-uh-ree]
noun Thermodynamics.
one thousand small calories. Abbreviation: kcal Also called Calorie, kilogram calorie, large calorie. Compare calorie ( def 1a ).

Origin:
1890–95; kilo- + calorie

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
calorie or calory (ˈkælərɪ)
 
n , pl -ries
Compare Calorie cal, gram calorie, Also called: small calorie 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 It has now largely been replaced by the joule for scientific purposes
 
[C19: from French, from Latin calor heat]
 
calory or calory
 
n
 
[C19: from French, from Latin calor heat]

Calorie (ˈkælərɪ)
 
n
1.  kilogram calorie, kilocalorie, Also called: large calorie, Cal a unit of heat, equal to one thousand calories, often used to express the heat output of an organism or the energy value of food
2.  the amount of a specific food capable of producing one thousand calories of energy

kilocalorie (ˈkɪləʊˌkælərɪ)
 
n
another name for Calorie

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

calorie
1866, from Fr. calorie, from L. calor (gen. caloris) "heat," from PIE *kle-os-, suffixed form of base *kele- "warm" (cf. L. calidus "warm," calere "be hot;" Skt. carad- "harvest," lit. "hot time;" Lith. silti "become warm," silus "August;" O.N. hlær, O.E. hleow "warm"). Technically, the heat required
to raise 1 kilogram of water 1 degree Celsius. In scientific use, largely replaced 1950 by the joule.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

calorie cal·o·rie (kāl'ə-rē)
n.

  1. A unit of energy-producing potential supplied by food and released upon oxidation by the body, equal to the amount of energy required to raise the temperature of 1 kilogram of water by 1°C at one atmosphere pressure. Also called nutritionist's calorie.

  2. The unit of heat equal to the amount of heat required to raise the temperature of 1 kilogram of water by 1°C at 1 atmosphere pressure. Also called kilocalorie, kilogram calorie, large calorie.

  3. Any of several approximately equal units of heat, each measured as the quantity of heat required to raise the temperature of 1 gram of water by 1°C from a standard initial temperature at 1 atmosphere pressure. Also called gram calorie, small calorie.

  4. The unit of heat equal to 1/100 the quantity of heat required to raise the temperature of 1 gram of water from 0 to 100°C at 1 atmosphere pressure. Also called mean calorie.

kilocalorie kil·o·cal·o·rie (kĭl'ə-kāl'ə-rē)
n.

Abbr. kcal See calorie.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
calorie   (kāl'ə-rē)  Pronunciation Key 
  1. A unit of energy equal to the amount of heat needed to raise the temperature of one gram of water by one degree Celsius. One calorie is equivalent to 4.1868 joules. Also called small calorie.

  2. Calorie A unit of heat equal to the amount of heat needed to raise the temperature of 1,000 grams of water by one degree Celsius. This unit is used as a measure of the energy released by food as it is digested by the human body. Also called kilocalorie, large calorie.


kilocalorie   (kĭl'ə-kāl'ə-rē)  Pronunciation Key 
See calorie.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

Calorie definition


The amount of heat required to raise the temperature of a kilogram of water by one degree Celsius. A calorie (with a lower-case c) is a measurement of the heat needed to raise the temperature of a gram of water, rather than a kilogram.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
The energy stored in food is measured in terms of calories.
Things you eat in your dreams have no calories or other unwanted things and you
  can eat all you want with no repercussions.
But when people have enough calories they need to diversify towards vegetables,
  pulses and meat.
By raising the surrounding air temperature, the bats would need to burn fewer
  calories to warm back up.
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