1. 凸出物；凸起部分
A protrusion is something that sticks out from something.

1. the act of projecting out from something

Synonym: projectionjutjutting

2. something that bulges out or is protuberant or projects from its surroundings

e.g. 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

Synonym: bulgebumphumpswellinggibbositygibbousnessjutprominenceprotuberanceextrusionexcrescence