Part of the eye that shares its name with a rainbow goddess (4)

I believe the answer is:

iris

(Other definitions for iris that I've seen before include "Eye diaphragm" , "A flower; spirit conjured in Tempest" , "Circular coloured membrane in the eye" , "who keeps pupil in?" , "Plant with sword-shaped leaves" .)

I've seen this clue in The New York Times.

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