gibbous

Meanings

1. 1
   adj

   having more than half but less than all of the visible disk illuminated, especially of the moon

   A waxing gibbous moon rose above the trees before sunset.

2. 2
   adj

   curved or bulging outward; convex

   The vessel had a gibbous side that projected beyond its base.

3. 3
   adj

   humped or abnormally curved, especially in reference to the back

   The old medical illustration showed a gibbous curvature of the spine.

From Middle English gibbous, from Latin gibbus ("hump, hunch"). The astronomical sense describes the moon or a planet as visibly bulging beyond a half disk while not yet full.

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