gibbosity

Meanings

1. 1
   noun

   the state of being convex or noticeably bulging

   The lens's gibbosity was visible in profile.

2. 2
   noun

   the illuminated, bulging appearance of the moon or another celestial body when more than half but not all of its disk is visible

   The moon's growing gibbosity was easy to observe each night.

Borrowed from French gibbosité and ultimately from Latin gibbus, 'hump' or 'hunch.' It denotes a bulging or convex condition and is also used of the rounded illuminated portion of a celestial body.

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