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protuberance (n.)

1640s, "a swelling tumor on the body; anything swelled or pushed beyond the surrounding or adjacent surface," 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"). Meaning "fact or condition of swelling or pushing beyond the surrounding or adjacent surface" is by 1680s. Related: Protuberancy.

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Definitions of protuberance from WordNet

protuberance (n.)
something that bulges out or is protuberant or projects from its surroundings;
the occipital protuberance was well developed
Synonyms: bulge / bump / hump / swelling / gibbosity / gibbousness / jut / prominence / protrusion / extrusion / excrescence
protuberance (n.)
the condition of being protuberant; the condition of bulging out;
the protuberance of his belly
From wordnet.princeton.edu