What is "protuberate"

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.

vb. 1 (context intransitive English) To bulge outward, producing a rounded protuberance. 2 (context transitive rare English) To cause to bulge outward.

1. v. cause to bulge out or project

2. form a rounded prominence; "The starved child's belly protuberated"