| Noun | 1. | St. Barbara's herb - any plant of the genus Barbarea: yellow-flowered Eurasian cresses; widely cultivated for winter salad cress, cress plant - any of various plants of the family Cruciferae with edible leaves that have a pungent taste Barbarea, genus Barbarea - biennial or perennial herbs of north temperate regions: winter cress Barbarea praecox, Barbarea verna, Belle Isle cress, early winter cress, land cress, American cress, American watercress - of southwestern Europe; cultivated in Florida |