kilogram calorie

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. See calorie.

Wiktionary

1. n. The amount of energy needed to raise the temperature of a kilogram of water by a degree centigrade: a unit of measure of energy.

WordNet 3.0

1. n. a unit of heat equal to the amount of heat required to raise the temperature of one kilogram of water by one degree at one atmosphere pressure; used by nutritionists to characterize the energy-producing potential in food