Webster's Revised Unabridged Dictionary · 1913

Excrescent

Excrescent , adjective

[Latin excresens, -entis, present participle 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
Collocations (1)
Excrescent letter (Philology) , a letter which has been added to a root; as, the d in alder (Anglo-Saxon alr) is an excrescent letter.