01 a. Growing out in an abnormal or morbid manner or as a superfluity.
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1.
Growing out in an abnormal or morbid manner or as a superfluity.“Expunge the whole, or lip the excrescent parts.” — Pope.
Phrases & compounds
Excrescent letter —
a letter which has been added to a root; as, the d in alder (AS. alr) is an excrescent letter.