Usually means: Energy unit for heat measurement.
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We found 41 dictionaries that define the word BTU:

General (17 matching dictionaries)
  1. Btu: Merriam-Webster
  2. BTU, Btu: Oxford Learner's Dictionaries
  3. BTU: American Heritage Dictionary of the English Language
  4. btu: Collins English Dictionary
  5. B.T.U, BTU: Vocabulary.com
  6. Btu, btu: Wordnik
  7. BTU: Wiktionary
  8. Btu: Webster's New World College Dictionary, 4th Ed.
  9. Btu: The Wordsmyth English Dictionary-Thesaurus
  10. B.T.U: Infoplease Dictionary
  11. Btu, b.t.u: Dictionary.com
  12. BTU (disambiguation), BTU, Btu: Wikipedia, the Free Encyclopedia
  13. B.t.u, Btu: Rhymezone
  14. b.t.u, btu: FreeDictionary.org
  15. b.t.u, btu: Mnemonic Dictionary
  16. B.T.U, BTU: TheFreeDictionary.com
  17. Btu: Merriam-Webster

Business (4 matching dictionaries)
  1. B.T.U: Webster's New World Finance & Investment Dictionary
  2. Construction Term Glossary (No longer online)
  3. BTU: Financial dictionary
  4. Glossary of Trade and Shipping Terms (No longer online)

Computing (2 matching dictionaries)
  1. I T Glossary (No longer online)
  2. B.T.U, Btu: Encyclopedia

Medicine (3 matching dictionaries)
  1. Btu: Merriam-Webster Medical Dictionary
  2. online medical dictionary (No longer online)
  3. BTU: Medical dictionary

Miscellaneous (2 matching dictionaries)
  1. BTU: Acronym Finder
  2. AbbreviationZ (No longer online)

Science (1 matching dictionary)
  1. Btu: Eric Weisstein's World of Physics

Slang (1 matching dictionary)
  1. B.T.U, BTU: Urban Dictionary

Tech (11 matching dictionaries)
  1. AUTOMOTIVE TERMS (No longer online)
  2. BTU: Building pathology glossary
  3. DOD Dictionary of Military Terms: Joint Acronyms and Abbreviations (No longer online)
  4. Efficient Windows (No longer online)
  5. B.T.U, Btu: Construction deterioration & building durability glossary
  6. Lake and Water Word Glossary (No longer online)
  7. Oil Analysis (No longer online)
  8. Schlumberger Oilfield Glossary (No longer online)
  9. Pool Glossary (No longer online)
  10. Rane Professional Audio Reference (No longer online)
  11. BTU: Power Engineering

(Note: See btus as well.)

Definitions from Wiktionary (BTU)

noun:  (energy) Initialism of British thermal unit. [The quantity of heat required to raise the temperature of one pound of water one degree Fahrenheit at a particular temperature (there are several different precise definitions) and a pressure of one atmosphere.]

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