Crossword Genius

Object that makes a rainbow (5)

Ross

I believe the answer is:

prism

(Other definitions for prism that I've seen before include "Disperser or reflector of light" , "Female character in The Importance of Being Earnest - optical device" , "Light-diffracting glass" , "Triangular piece of glass to deviate a beam" , "Light-splitting glass" .)

I've seen this clue in the USA Today.
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