Origin of Gibbous
From Middle English, from Latin gibbus (“humped, hunched”), probably cognate with cubō (“bend oneself, lie down”), Italian gobba (“humpback”), Greek κύφος (kýfos, “humpback, bent”), κύβος (kývos, “cube, vertebra”).
Middle English bulging from Late Latin gibbōsus hunch-backed from Latin gibbus hump
From American Heritage Dictionary of the English Language, 5th Edition
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