-_məs noun
Etymology: New Latin, from Latin, henbane, from Greek hyoskyamos, literally, swine's bean, from hyos (gen. of hys swine) + kyamos bean — more at sow (swine)
1. capitalized : a genus of poisonous Eurasian herbs (family Solanaceae) having simple leaves, somewhat irregular flowers, and circumscissile capsular fruit — see henbane
2. -es : the dried leaves of the henbane containing the alkaloids hyoscyamine and scopolamine and used as an antispasmodic and sedative