The Collaborative International Dictionary of English v.0.48:

Picus \Pi"cus\, n.; pl. Pici. [L., a woodpecker.] (Zool.)
   A genus of woodpeckers, including some of the common American
   and European species.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Picus
    n 1: type genus of Picidae [syn: Picus, genus Picus]