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Definition of: gibbous
(gib′əs) adjective
1. Irregularly rounded; convex, as the moon when less than full and yet more than half full.
2. Humpbacked.
3. Bot. Swollen on one side, as the calyx of a lupine. Also gib·bose (gib′ōs, gi·bōs′). [<L gibbosus <gibbus a hump]
—gib′bous·ly adverb
—gib′bous·ness noun
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