hyoscyamus

noun
hyo·scy·a·mus | \ -məs \

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

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occurring twice a year or every two years

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