What does caloric mean?
Caloric is an adjective meaning relating to heat or, most commonly today, to the energy content of food as measured in calories. Nutritionists speak of caloric intake, caloric restriction, and caloric deficits when describing how much energy a person consumes relative to what they expend, and the word carries a precise, technical register suited to medical and scientific contexts. Caloric also survives as a noun in the history of physics: in the eighteenth century, leading scientists including Lavoisier believed heat was an invisible, self-repelling fluid they named caloric, which flowed from hot bodies to cold ones. That theory collapsed in the following decades when experiments showed that friction could generate heat indefinitely, proving heat to be a form of motion rather than a substance. Derived from the Latin calor, meaning heat, caloric remains useful chiefly wherever energy and metabolism are discussed.
Of or relating to calories, especially the energy supplied by food; also, in broader older usage, relating to heat.
"A sedentary lifestyle requires a lower caloric intake than manual labor does."
(Historical physics) the hypothetical weightless, self-repellent fluid formerly supposed to be the medium by which heat is transmitted.
"According to the caloric theory, rubbing two surfaces together merely squeezed caloric out of them."
This noun sense is now confined to accounts of the history of science.
For over half a century, scientists believed heat was an invisible fluid called caloric flowing through matter — until Count Rumford proved them wrong by boring cannon barrels and watching friction make limitless heat.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of caloric
Caloric derives from Latin calor, meaning heat, which itself traces back to the Indo-European root underlying words for warmth and burning. The term entered English in the late eighteenth century through French scientific writing associated with Antoine Lavoisier, whose school coined "calorique" as the name for their hypothesized fluid of heat. It shares this Latin ancestry with calorie and calorimeter, and more distantly with everyday words such as cauldron and nonchalant, which descend from related forms of the same root.
Related word forms
How caloric is actually used
The adjectival sense relating to dietary energy is standard in nutrition, medicine, and fitness writing, where it carries a neutral, technical register. In everyday speech people more often say "calories" than "caloric." The noun sense belongs almost entirely to the history of science and appears today mainly in textbooks, popular-science writing, and discussions of the caloric theory of heat.
Easily confused with caloric
"Calorie" is a noun denoting a unit of food energy, while "caloric" is primarily an adjective describing anything relating to calories or heat.