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(1) Adventitious [ Botany ] Dictionary of botanic terminology - index of names
     
  In botany any organ arising, in an abnormal, unusual or unexpected position or place.  
     
Occurring away from its natural location, e.g. roots arising from the shoot system, buds from the roots or along a stem not in the usual place, generally in reaction to a wound. (For example an adventitious bud)
     
(2) Adventitious Or Adventive [ Ecology ]
     
  Out of the usual place, referring to an organism introduced accidentally in a new territory but not fully naturalized.  
     
 
 
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