Crossword Genius

What nephology is the study of (6)

Ross

I believe the answer is:

clouds

(Other definitions for clouds that I've seen before include "Masses of vapour floating in the atmosphere" , "becomes opaque" , "Masses of condensed vapour floating high above" , "Visible masses in the air" , "work by 3 [FRAYN] ?" .)

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