Webster's English Dictionary

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infest

in.fest \in-'fest\ \-'fes-t*nt\ \.in-.fes-'ta--sh*n\ \in-'fes-t*r\ vt [MF 
   infester, fr. L infestare, fr. infestus hostile] 1: to spread or swarm in 
   or over in a troublesome manner  2: to live in or on as a parasite  - 
   in.fes.tant n