excrescent /ɪkˈskɹɛsənt/noun 2adjective 1forms 3 noun2 •A growing mutation, usually abnormal. •A sound in a word without etymological reason."B" in "nimble" is an excrescent. adjective1 •Growing out in an abnormal or morbid manner or as a superfluity.Expunge the whole, or lop th' excrescent parts. — 1733 formsexcrescents · more excrescent · most excrescent