1. something that sticks out or extends beyond a surface
2. the act of protruding or sticking out

Examples

• The rock had a sharp protrusion that could cut your hand.
• There was a small protrusion on the wall where the pipe ran through.
• The protrusion of his jaw showed his determination.
• The building’s unusual protrusion made it stand out from the others.
• She felt a painful protrusion on her ankle after the fall.
• The protrusion of the cliff created a natural shelter below.