Crossword Genius

AC meas (3)

Ross

I believe the answer is:

btu

(Other definitions for btu that I've seen before include "Unit of energy related to Fahrenheit" , "British thermal unit (abbrev.)" .)

I've seen this clue in The Chronicle of Higher Education, the LA Times, the Boston Globe, the Wall Street Journal, the King Feature Syndicate and The New York Times.
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