When the moon is more than half full, this is an example of a gibbous moon.
When you have a humpback, this is an example of a gibbous back.
Origin of gibbous
- Middle English bulging from Late Latin gibbōsus hunch-backed from Latin gibbus hump
From American Heritage Dictionary of the English Language, 5th Edition
- 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”).