Crossword Genius

Classic sci-fi novel featuring the messianic figure known as the Kwisatz Haderach (4)

Ross

I believe the answer is:

dune

(Other definitions for dune that I've seen before include "Ridge of wind-blown sand" , "Low hill of sand, called in a desert a barkhan" , "Coastal sand hill" , "Sandhill" , "Mound of drifted sand" .)

I've seen this clue in The Washington Post.
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