growing abnormally out of something else; superfluous.
Phonetics. (of a speech sound) inserted or added as a result of articulatory interaction or impetus, as the t-sound in sense (sents) or against (from Middle English ageynes), without grammatical or historical justification; intrusive; parasitic.
Origin of excrescent
1600–10; < Latinexcrēscent- (stem of excrēscēns), present participle of excrēscere to grow out. See ex-1, crescent
Related formsex·cres·cent·ly, adverbsu·per·ex·cres·cent, adjectivesu·per·ex·cres·cent·ly, adverbun·ex·cres·cent, adjectiveun·ex·cres·cent·ly, adverb