Etymology
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excrescence (n.)

early 15c., "action of growing out," from Latin excrescentia (plural) "abnormal growths," from excrescentem (nominative excrescens), present participle of excrescere "grow out, grow up," from ex "out" (see ex-) + crescere "to grow" (from PIE root *ker- (2) "to grow"). Meaning "that which grows out abnormally" (on a living thing) is from 1570s (excrescency in this sense is 1540s).

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Definitions of excrescence

excrescence (n.)
something that bulges out or is protuberant or projects from its surroundings;
the bony excrescence between its horns
Synonyms: bulge / bump / hump / swelling / gibbosity / gibbousness / jut / prominence / protuberance / protrusion / extrusion
excrescence (n.)
(pathology) an abnormal outgrowth or enlargement of some part of the body;
From wordnet.princeton.edu