Jamis has been called by Him, by Shai-hulud, who has ordained the phases for the moons that daily wane and—in the end—appear as bent and withered twigs.
-Stilgar’s preface to "Muad’Dib, the Man" by the Princess Irulan Stilgar’s troop returning to the sietch with its two strays from the desert climbed out of the basin in the waning light of the first moon.
There are no more uses of "wane" in the book.
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Our passion has waned over the years, but our love has grown.
The moon was waning, but I could still see the trail.