Entry 1 sense Webster, 1913 coralroot · IPA 01 n. a European bittercress (Dentaria bulbifera) having a knotted white rootstock. 1. a European bittercress (Dentaria bulbifera) having a knotted white rootstock. Syn. coral-root bittercress, coralwort, Cardamine bulbifera, Dentaria bulbifera.