Webster's English Dictionary

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adventitious

Cross references:
  1. accidental            
 
ad.ven.ti.tious \.ad-v*n-'tish-*s\ aj [L adventicius] 1: added 
   extrinsically and not inherent or innate  2: arising or occurring 
   sporadically or in other than the usual location  - ad.ven.ti.tious.ly av