Etymology
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excrescent (adj.)

mid-15c., "resulting from addition, greater," from Latin 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"). From c. 1600 as "growing out of something else," especially abnormally or superfluously.

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Definitions of excrescent

excrescent (adj.)
forming an outgrowth (usually an excessive outgrowth);
From wordnet.princeton.edu