The crossword solution for the term 'roundish protrusion' is 'BULGE'. A BULGE is a rounded, outwardly projecting part of an object or surface. It is typically caused by pressure from within, such as when a balloon is filled with air. Bulges can also be caused by external forces, such as when a wall is pushed outward by a heavy load. Bulges are often seen in nature, such as in the shape of a mountain or hill.