This is the 7265th most frequent Spanish word.
gibosa
Hunched or convex in shape; often used to describe a gibbous moon.
This sentence uses gibosa to describe the type of moon that is more than half illuminated but not quite full, a specific astronomical term.
La noche era clara y se veía una luna gibosa en el cielo.
The night was clear and a gibbous moon was visible in the sky.
In this context, giboso/a refers to something having a hump or a convex shape, here used figuratively to describe the turtle's shell.
La tortuga tenía un caparazón giboso que destacaba entre las demás.
The turtle had a humped shell that stood out among the others.
This example shows how giboso/a can describe an object's physical irregularity, indicating a curvature or bulge.