invade

in·vade

vt \in-ˈvād\

in·vad·edin·vad·ing

Definition of INVADE

1

: to enter and spread within either normally (as in development) or abnormally (as in infection) often with harmful effects <protect the body from invading viruses> <branches of a nerve invade the skin area>

2

: to affect injuriously and progressively <gangrene invades healthy tissue>

—in·vad·er \-ˈvād-ər\ noun