1640s, from Late Latin protuberantem (nominative protuberans), present participle of protuberare "to swell, bulge, grow forth," from Latin pro "forward" (see pro-) + tuber "lump, swelling" (from PIE root *teue- "to swell").
the occipital protuberance was well developed
the protuberance of his belly
protract
protraction
protractor
protrude
protrusion
protuberance
protuberant
proud
proudly
provable
prove
