Crossword Genius

Rainbow shapes (4)

Ross

I believe the answer is:

'rainbow shapes' is the definition.
(I've seen this in another clue)

This is all the clue.

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

I've seen this clue in the USA Today, The New York Times, the LA Times, the Universal, the King Feature Syndicate, The Mirror and the Newsday.
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