- The definition of gibbous refers to a moon in between a half-moon but less than a full moon, or something that protrudes or creates an obvious bulge.
- 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.
- protuberant; rounded and bulging
- designating the moon, a planet, etc. in that phase in which more than half, but not all, of the face reflects sunlight to the earth
- humpbacked; kyphotic
Origin of gibbousMiddle English ; from Classical Latin gibbosus ; from gibba: see gib
- a. Characterized by convexity; protuberant: a gibbous seashell.b. More than half but less than fully illuminated from the point of view of an observer. Used of phases of the moon or the planets.
- Archaic Having a hump; humpbacked.
Origin of gibbousMiddle English, bulging, from Late Latin gibbōsus, hunch-backed, from Latin gibbus, hump.
(comparative more gibbous, superlative most 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”).