1. 
[syn: bittercress, bitter cress]
The Collaborative International Dictionary of English v.0.48:
bittercress \bit"ter*cress\ n.
   any of various herbs of the genus Cardamine, having usually
   pinnate leaves and racemes of white, pink or purple flowers;
   cosmopolitan except in the Antarctic.
   Syn: bitter cress.
        [WordNet 1.5]
WordNet (r) 3.0 (2006):
bittercress
    n 1: any of various herbs of the genus Cardamine, having usually
         pinnate leaves and racemes of white, pink or purple
         flowers; cosmopolitan except Antarctic [syn: bittercress,
         bitter cress]