The term 'caloric unit' is often used to refer to the amount of energy contained in a given amount of food. The crossword solution for this term is 'therm, ' which is a unit of energy equal to 100, 000 British thermal units (BTUs). A BTU is the amount of energy required to raise the temperature of one pound of water by one degree Fahrenheit. In other words, a therm is the amount of energy needed to heat up 100, 000 pounds of water by one degree Fahrenheit.