Entry 1 sense Webster, 1913 Stramonium · Stra·mo·ni·um · IPA 01 n. A poisonous plant (Datura Stramonium); stinkweed. See Datura, and Jamestown weed. 1. A poisonous plant (Datura Stramonium); stinkweed. See Datura, and Jamestown weed.(Bot.) See: Datura, Jamestown weed