Btu

WordReference Random House Learner's Dictionary of American English © 2026

Btu or BTU, an abbreviation of:

1. Physics British thermal unit.

WordReference Random House Unabridged Dictionary of American English © 2026

B.T.U., [Physics.]

1. Physics British thermal unit;
   British thermal units.

Also, BTU, B.t.u., B.th.u., Btu 

Collins Concise English Dictionary © HarperCollins Publishers::

btu, BThU abbreviation

1. British thermal unit
   US abbreviation: BTU