2 definitions found From WordNet (r) 2.0 [wn]: excrescent adjective: forming an outgrowth (usually an excessive outgrowth) From The Collaborative International Dictionary of English v.0.44 [gcide]: Excrescent \Ex*cres"cent\, adjective [L. excresens, -entis, p. pr. of excrescere to grow out; ex out + crescere to grow. See {Crescent}.] Growing out in an abnormal or morbid manner or as a superfluity. Expunge the whole, or lip the excrescent parts. --Pope. {Excrescent letter} (Philol.), a letter which has been added to a root; as, the d in alder (AS. alr) is an excrescent letter.

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