WordReference Random House Unabridged Dictionary of American English © 2025
pro•tu•ber•ate 
(prō to̅o̅′bə rāt′, -tyo̅o̅′-, prə-),USA pronunciation v.i., -at•ed, -at•ing. 
            - to bulge out, forming a rounded projection.
 
- Late Latin prōtūberātus, past participle of prōtūberāre. See protuberant, -ate1
 - 1570–80