— infester , n.
/in fest"/ , v.t.
1. to live in or overrun to an unwanted degree or in a troublesome manner, esp. as predatory animals or vermin do: Sharks infested the coastline.
2. to be numerous in, as anything undesirable or troublesome: the cares that infest the day.
3. Archaic. to harass.
[ 1375-1425; late ME infestare to assail, molest, deriv. of infestus hostile ]