Webster's English Dictionary

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excrescent

ex.cres.cent \-*nt\ aj [L excrescent-, excrescens, prp. of excrescere to 
   grow out, f]r. ex- + crescere to grow 1: growing out or forming an 
   outgrowth; esp : forming an abnormal,  excessive, or useless outgrowth 2: 
   EPENTHETIC  - ex.cres.cent.ly av