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The Collaborative International Dictionary
Hyoscyamus

Hyoscyamus \Hy`os*cy"a*mus\, n. [L., fr. Gr. ?; ? a sow, hog + ? a bean.]

  1. (Bot.) A genus of poisonous plants of the Nightshade family; henbane.

  2. (Med.) The leaves of the black henbane ( Hyoscyamus niger), used in neuralgic and pectorial troubles.

Wiktionary
hyoscyamus

n. 1 (context botany English) Any of the genus (taxlink Hyoscamus genus) of henbanes. 2 (context medicine English) The leaf of the black henbane ((taxlink Hyoscyamus niger species)), used in neuralgic and pectoral troubles.

Wikipedia
Hyoscyamus

Hyoscyamus — known as the henbanes — is a small genus of flowering plants in the nightshade family, Solanaceae. It comprises 11 species, all of which are toxic. It, along with other genera in the same family, is a source of the drug hyoscyamine (daturine).

Usage examples of "hyoscyamus".

I also procured some extract of hyoscyamus from three shops, and made infusions of the same strength as before.

If elements of this latter nature had been present in the leaves, it might have been expected that morphia, hyoscyamus, atropine, veratrine, colchicine, curare, and diluted alcohol would have produced some marked effect.