The Collaborative International Dictionary of English v.0.48:

cattleya \cattleya\ n.
   any orchid of the genus Cattleya characterized by a
   hood-shaped three-lobed lip enclosing the column; they are
   among the most popular and most extravagantly beautiful
   orchids known. Called also cattleya orchid.
   [WordNet 1.5]

WordNet (r) 3.0 (2006):

cattleya
    n 1: any orchid of the genus Cattleya characterized by a three-
         lobed lip enclosing the column; among the most popular and
         most extravagantly beautiful orchids known