(a.) Excessively prominent; bulging\ beyond the surrounding or adjacent surface; swelling; as, a protuberant joint; a protuberant eye.

beetling bold bulbous bulging distended eminent emissile excrescent excrescential extruding extrusive gibbous jutting outstanding overhanging prognathous projecting prominent protrudent protruding protrusile protrusive protuberating salient swelling swollen tumescent tumid turgid