gibbousness

Noun
  1. something that bulges out or is protuberant or projects from its surroundings
    • the gun in his pocket made an obvious bulge
    • the hump of a camel
    • he stood on the rocky prominence
    • the occipital protuberance was well developed
    • the bony excrescence between its horns
gibbousness
The moon's gibbousness is clearly visible in the night sky.