Emily Dickinson Lexicon

HY-OS-CY-AM'I-NA, or HY-OS-CY'A-MA, n.

An alkaloid obtained from Hyoscyamus niger, and considered to be new and peculiar. Thomson supposes that it is identical with Atropina or Daturina; but the effects of Hyoscyamus differ too much from Atropa and Datura, to allow any probability to Thomson's hypothesis.