intransitive verb
pro·​tu·​ber·​ate | \-əˌrāt\

Definition of protuberate 

: to swell beyond a surface : form a protuberance

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History and Etymology for protuberate

Late Latin protuberatus, past participle of protuberare to bulge out, from Latin pro- pro- entry 1 + tuber bump, swelling, tumor

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