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a. A unit of heat equal to 100,000 British thermal units (1.054 × 108 joules).
b. A unit of heat equal to 1,000 large calories.
a. A unit of heat equal to the large calorie.
b. A unit of heat equal to the small calorie.

[Greek thermē, heat, from thermos, warm, hot; see gwher- in Indo-European roots.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Units) Brit a unit of heat equal to 100 000 British thermal units. One therm is equal to 1.055 056 × 108 joules
[C19: from Greek thermē heat]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014



any of several units of heat, as one equivalent to 1000 large calories or 100,000 British thermal units.
[1885–90; < Greek thérmē heat]


var. of thermo- before a vowel: thermion.


var. of thermo- as a final element: ectotherm.


Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.therm - a unit of heat equal to 100,000 British thermal units
energy unit, heat unit, work unit - a unit of measurement for work
B.Th.U., British thermal unit, BTU - a unit of heat equal to the amount of heat required to raise one pound of water one degree Fahrenheit at one atmosphere pressure; equivalent to 251.997 calories
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.


[θɜːm] Ntermia f
Collins Spanish Dictionary - Complete and Unabridged 8th Edition 2005 © William Collins Sons & Co. Ltd. 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005


[θɜːm] n1.055 056 x 10^8 joule (unità termica usata in Gran Bretagna)
Collins Italian Dictionary 1st Edition © HarperCollins Publishers 1995
References in periodicals archive ?
The NJ BPU also granted PSE&G approval to increase its balancing charge from 9 cents to 10 cents per therm. The charge adjusts for differences between the amount of gas delivered for a customer daily versus the amount used.View the full article from NJBIZ at
Established for some 20 years, Low Therm are leaders in their specialist field and are considered trailblazers within the low carbon building sector.
The Tetra Therm Aseptic Flex 1 can be installed as a stand-alone unit or as part of a complete dairy line solution.
Top Therm Generation 'Blue e' cooling units also benefit from the Eco-mode control system, which together with the use of energy efficient EC fan technology, provides increased energy savings up to 45%, reduced costs and helps to conserve the environment.
This should mean that a residential customer who uses 200 therms in the month of February would see a decrease of USD30 from their bill.
I also have at least 6 rigged Polar Therms with me at all times.
The intra-day contract gained 0.5 pence, or 1%, to 49.6 pence a therm. Deliveries from Norway and the Isle of Grain LNG terminal declined, according to grid data.
Oil has slumped to less than half the highs seen in July, helping wholesale gas prices fall around 20% since the record 100p a therm levels in the summer.
Norway is a major supplier to the UK and the forward price for delivery here this winter rose to 104p per therm from 90.75p.
The announcement sent the forward price of gas for delivery to Britain this winter rocketing to 104p per therm from 90.75p per therm at the start of the day.