protuberance
     n 1: something that bulges out or is protuberant or projects from
          a form [syn: {bulge}, {bump}, {hump}, {gibbosity}, {gibbousness},
           {jut}, {prominence}, {protrusion}, {extrusion}, {excrescence}]
     2: the condition of being protuberant; the condition of bulging
        out; "the protuberance of his belly"
Source: WordNet® 2.0