Zigadenus venenosus zi·ga·de·nusvenenosus uncommon noun 1. plant of western North America to Mexico; poisonous especially to grazing animals Synonymsgrassy death camasZigadenus venenosusZigadenus venenosus gramineus Related words Word family Zigadenus venenosus gramineus Broader terms death camas Parts Zigadenus WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.