Crossword Genius

Rainbow shapes (4)

Ross

I believe the answer is:

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">rainbow shapes</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(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 LA Times, the King Feature Syndicate, The New York Times, the Universal, The Mirror, the USA Today and the Newsday.
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