caloric (n.)youdaoicibaDictYouDict[caloric 词源字典]
hypothetical fluid in a now-discarded model of heat exchange, 1792, from French calorique, coined in this sense by Lavoisier, from Latin calorem "heat" (nominative calor; see calorie). The adjective is recorded from 1865.[caloric etymology, caloric origin, 英语词源]