Medical Definition of hyoscyamus
1 capitalized : a genus of poisonous Eurasian herbs of the family Solanaceae that have a capsular fruit and include the henbane (H. niger)
2: the dried leaves of the henbane containing the alkaloids hyoscyamine and scopolamine and used as an antispasmodic and sedative
Seen and Heard
What made you want to look up hyoscyamus? Please tell us where you read or heard it (including the quote, if possible).