protuberate

from WordNet (r) 3.0 (2006)

protuberate
    v 1: cause to bulge out or project
    2: form a rounded prominence; "The starved child's belly
       protuberated"

from The Collaborative International Dictionary of English v.0.48

Protuberate \Pro*tu"ber*ate\, v. i. [L. protuberare; pro forward
   + tuber a hump, protuberance. See {Tuber}.]
   To swell, or be prominent, beyond the adjacent surface; to
   bulge out. --S. Sharp.
   [1913 Webster]