From Longman Dictionary of Contemporary Englishthermtherm /θɜːm $ θɜːrm/ noun [countable] TMa unit for measuring heat, especially when calculating amounts of gas used UK gas was selling for as little as 6p a therm.
Examples from the Corpus
therm• For example, from March 1996 to February 1997 under the annual system, baseline gas rates were 53 cents per therm.therm-therm- /θɜːm $ θɜːrm/ prefix XXanother form of thermo-From Longman Business Dictionarythermtherm /θɜːmθɜːrm/ noun [countable] a measurement of heat equal to 100,000 British Thermal Units, used in Britain for measuring how much gas someone has usedOrigin therm (1900-2000) Greek therme “heat” 