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Synonyms
pro·tu·ber·ate (prō-tōṓbə-rāt́, -tyōṓ-, prə-)

[Late Latin prōtūberāre, prōtūberāt-, Latin prō-, forth; see pro–1, + Latin tūber, a swelling.]

intransitive verb: -at·ed, -at·ing, -ates. 

To swell or bulge.

derivatives

pro·túber·átion
noun