To protrude means to push outward. If something is protruding, it is sticking out from something else. It may also mean to project.
cape
sticks out
it sticks out
lateral pteregoid
chicken
India
reed
This is when your lip protrudes due to teeth.
Shaft
Your fibula.
Wonderland
The word protrude is a verb (protrude, protrudes, protuding, protruded). The noun forms are protrusion and the gerund, protruding.