| Jamestown weed | (Bot.) The poisonous thorn apple or stramonium (Datura stramonium), a rank weed early noticed at ☞ This name is often corrupted into jimson, jimpson, and gympsum. [ 1913 Webster ] |
| jimsonweed | (n) intensely poisonous tall coarse annual tropical weed having rank-smelling foliage, large white or violet trumpet-shaped flowers and prickly fruits, Syn. apple of Peru, Datura stramonium, common thorn apple, Jamestown weed, jimson weed |