ˈjibəs, ˈgi- adjective
Etymology: Middle English, from Middle French gibbeux, from Late Latin gibbosus
1.
a. : marked by convexity : rounded , protuberant
b. of the moon or a planet : seen with more than half but not all of the apparent disk illuminated — see configuration illustration, moon illustration
c. : swollen or protuberant on one side
2. : having a hump : humpbacked
these gibbous human shapes — Thomas Hardy
• gib·bous·ly adverb
• gib·bous·ness noun -es