The Collaborative International Dictionary of English v.0.48:

Corallorhiza \Corallorhiza\ n.
   a genus of leafless root-parasitic orchids having small
   purplish or yellowish racemose flowers with lobed lips; it is
   widely distributed in temperate regions.

   Syn: genus Corallorhiza.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Corallorhiza
    n 1: genus of leafless root-parasitic orchids having small
         purplish or yellowish racemose flowers with lobed lips;
         widely distributed in temperate regions [syn:
         Corallorhiza, genus Corallorhiza]