Crossword Genius

Shapes of rainbows (4)

Ross

I believe the answer is:

arcs

(Other definitions for arcs that I've seen before include "Parts of a circle" , "Segments of a circle" , "Curving trajectories" , "Streaks of electrical discharges" , "Cars (anag)" .)

I've seen this clue in The New York Times and the Newsday.com.
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