n 1  cap  :  a large genus of the buttercup family (Ranunculaceae) that comprises chiefly perennial erect branching herbs with divided leaves and flowers in showy spikes and includes several esp. of the western U.S. that are toxic to grazing animals and esp. cattle - see LARKSPUR STAVESACRE   2  :  any plant of the genus Delphinium .
 
 
 
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