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"
the act of projecting out from something
- Thumb-sucking can cause protrusion of the teeth.