To extend from, above or beyond a surface or boundary; to bulge outward; to stick out
Archegonia are surrounded early in their development by the juvenile perianth, through the slender beak of which the elongated neck of the fertilized archegonium protrudes.
If something protrudes from somewhere, it sticks out. a huge round mass of smooth rock protruding from the water The tip of her tongue was protruding slightly. + protruding pro·trud·ing protruding ears. to stick out from somewhere protrude from (protrudere, from trudere )