Noun
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
Source: WordNetNutrition main In a nutritional context, the kilojoule (kJ) is the SI unit of food energy, although the kilocalorie is still in common use. citation The word calorie is popularly used with the number of kilocalories of nutritional energy measured. Source: Internet
The large or dietary calorie (Cal) is equal to one kilocalorie (kcal), and is gradually being replaced by the latter correct term. Early values for the explosive energy released by trinitrotoluene (TNT) ranged from 900 to 1100 calories per gram. Source: Internet