1. (used of the moon) more than half full
   "The gibbous moon cast a bright light over the landscape";
   - gibbose
    
2. (botany, zoology) having a rounded protuberance or swelling
   "The gibbous shell of this beetle species is distinctive";
   - gibbose
    
3. Characteristic of or suffering from kyphosis, an abnormality of the vertebral column
   "The elderly man's gibbous spine caused him to stoop";
   - crookback [archaic], crookbacked [archaic], humpbacked, hunchbacked, kyphotic [technical], hunchback

See also: bulging, convex, unfit

Encyclopedia: Gibbous