therm(redirected from Decatherm)
Also found in: Dictionary, Thesaurus, Acronyms, Encyclopedia.
A unit of heat used indiscriminately for: 1) a small calorie, 2) a large calorie, 3) 1000 large calories, 4) 100,000 British thermal units.
[G. thermē, heat]
therm(therm) a unit of heat. The word has been used as equivalent to (a) large calorie; (b) small calorie; (c) 1000 large calories; (d) 100,000 British thermal units.
therm(therm) [Gr. therme, heat]
Any of a several units of heat.See: MET
the amount of heat input required to raise the temperature of 1000 kg of water by 1°C. One therm = 1000 kilocalories = 1 megacalorie (Mcal) = 106 megajoule.