ex·cres·cent /-sṇt/
  (a.)異常生長的,多餘的,浪費的
  ex·cres·cent /ɪkˈskrɛsṇt/ 形容詞
  贅疣樣的,贅生物的,具小瘤的,突起的,具小瘤的
  Ex·cres·cent a.  Growing out in an abnormal or morbid manner or as a superfluity.
     Expunge the whole, or lip the excrescent parts.   --Pope.
  Excrescent letter Philol., a letter which has been added to a root; as, the d in alder (AS. alr) is an excrescent letter.
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  excrescent
       adj : forming an outgrowth (usually an excessive outgrowth)