Crossword Genius

Wispy clouds (5)

Ross

I believe the answer is:

cirri

'wispy clouds' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for cirri that I've seen before include "Highest clouds" , "High altitude clouds forming 'mare's tails'" , "High wisps of clouds" .)

I've seen this clue in The New York Times, The Wall Street Journal and the Universal.
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