Crossword Genius

Less than 90º, as an angle (5)

Ross

I believe the answer is:

acute

(Other definitions for acute that I've seen before include "feature at the beginning and end of a French summer" , "(Of an angle) less than 90deg" , "Short and severe" , "Sharp, angle or mind" , "Grave" .)

I've seen this clue in The New York Times.
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