The Collaborative International Dictionary of English v.0.48:

Cupressus \Cupressus\ n.
   one of the genera of cypress trees, the type genus of the
   Cupressaceae.

   Syn: genus Cupressus.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Cupressus
    n 1: type genus of Cupressaceae [syn: Cupressus, genus
         Cupressus]