The Collaborative International Dictionary of English v.0.48:

Coralwort \Cor"al*wort`\, n. (Bot.)
   A cruciferous herb of certain species of Dentaria; --
   called also toothwort, tooth violet, or pepper root.
   [1913 Webster]

WordNet (r) 3.0 (2006):

coralwort
    n 1: European bittercress having a knotted white rootstock [syn:
         coral-root bittercress, coralroot, coralwort,
         Cardamine bulbifera, Dentaria bulbifera]