The Collaborative International Dictionary of English v.0.48:

Pediculus \Pe*dic"u*lus\, prop. n.; pl. Pediculi. [L., a
   louse.] (Zool.)
   A genus of wingless parasitic Hemiptera, including the common
   lice of man. See Louse.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Pediculus
    n 1: type genus of Pediculidae: true lice infecting humans [syn:
         Pediculus, genus Pediculus]