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 Wall Street Journal, the King Feature Syndicate, The Chronicle of Higher Education, The New York Times, the Boston Globe and the LA Times.
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