Crossword Genius

Rainbows, e.g (4)

Ross

I believe the answer is:

arcs

(Other definitions for arcs that I've seen before include "formations not straight" , "Streaks of electrical discharges" , "Bows" , "Portions of a circle" , "Segments of a circle" .)

I've seen this clue in The New York Times, the Universal and the LA Times.
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