the GNU version of the Collaborative International Dictionary of English
adj. Relating to heat, or to the production of heat; producing heat; thermogenous.
The Century Dictionary and Cyclopedia
Of or pertaining to the production of heat; producing heat.
Word Usage
"The calorie-burning process of digestion is called the thermogenic effect of food and occurs as protein is reduced to amino acids, carbohydrates to simple sugars, and fats to fatty acids."