The Collaborative International Dictionary of English v.0.48:

Brassia \Brassia\ n.
   a genus of tropical American epiphytic orchids having
   striking axillary racemes of yellow to green spiderlike
   flowers with long slender sepals and warty lips; the spider
   orchids.

   Syn: genus Brassia.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Brassia
    n 1: genus of tropical American epiphytic orchids having
         striking axillary racemes of yellow to green spiderlike
         flowers with long slender sepals and warty lips: spider
         orchids [syn: Brassia, genus Brassia]