Ex‐cres″cent (?), a. [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.