Crossword Genius

Peaks of waves (6)

Ross

I believe the answer is:

crests

(Other definitions for crests that I've seen before include "Emblems of families" , "Topmost ridges of mountains" , "Tufts on birds' heads, or tops of waves" , "summits" .)

I've seen this clue in the Newsday.com and The New York Times.
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