gibbous \GIB-uhs\,
adjective:
1. Astronomy. (of a heavenly body) convex at both edges, as the moon when more than half full.
2. humpbacked
Saturday is full moon, so we will celebrate—if we are lucky with the weather—by the light of a waxing gibbous moon.
-- A. S. Byatt, "The Children's Book," 2009
The stars and the gibbous moon demanded to be looked at, and when one meteorite had streaked across the sky, you could not help waiting, open-eyed and alert…
-- Aldous Huxley, "Crome Yellow," 1921
Gibbous entered English late 14th or early 15th century from the Latin gibbus meaning hump.
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