• WordNet 3.6
    • n kilocalorie 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
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In literature:

Analysis of the little data available indicates a best estimate of 2 mg of nitrogen per kilocalorie of basal energy expenditure.
"Significant Achievements in Space Bioscience 1958-1964" by National Aeronautics and Space Administration

In science:

Each interaction energy is small, but because of their large numbers, the total free energies in the native and denatured states are large, being some thousands of kilocalories per mole, depending on the size of the protein.
Simple models of protein folding and of non--conventional drug design
The universal gas constant can also be expressed in units of kilocalorie per mole kelvin, kcal/(mol·K) [i.e., R = 1.98588 kcal/(mol·K)].
A Review of Accelerated Test Models
In this case, Ea is in units of kilocalorie per mole (kcal/mol).
A Review of Accelerated Test Models