Source : WordNet®

winter fern
     n : large branching biennial herb native to Eurasia and Africa
         and adventive in North America having large fernlike
         leaves and white flowers; usually found in damp habitats;
         all parts extremely poisonous [syn: {hemlock}, {poison
         hemlock}, {poison parsley}, {California fern}, {Nebraska
         fern}, {Conium maculatum}]