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protrusion (n.)

1640s, from French protrusion, noun of action from past participle stem of Latin protrudere "to push out" (see protrude), or from a similar formation in English.

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Definitions of protrusion from WordNet

protrusion (n.)
something that bulges out or is protuberant or projects from its surroundings;
Synonyms: bulge / bump / hump / swelling / gibbosity / gibbousness / jut / prominence / protuberance / extrusion / excrescence
protrusion (n.)
the act of projecting out from something;
Synonyms: projection / jut / jutting
From wordnet.princeton.edu