excrescent
adjective
ex·cres·cent ik-ˈskre-sᵊnt 
ek-
1
: forming an abnormal, excessive, or useless outgrowth
2
: of, relating to, or constituting epenthesis
excrescently adverb
Word History
Etymology
Latin excrescent-, excrescens, present participle of excrescere to grow out, from ex- + crescere to grow — more at crescent
First Known Use
1633, in the meaning defined at sense 1