vt, in*vad*ed  in*vad*ing  1  :  to enter and spread within either normally (as in development) or abnormally (as in infection) often with harmful effects <protect the body from invadingviruses>  <branches of a nerve the skin area>   2  :  to affect injuriously and progressively <gangrene shealthy tissue>  in*vad*er n 
 
 
 
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