Wordnet 3.0
VERB (2)
1.
cause to bulge out or project;
2.
form a rounded prominence;
- Example: "The starved child's belly protuberated"
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]
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"