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Entry 1 sense Webster, 1913

Helleborein

· Hel·le·bo·re·in · IPA
01 n. A poisonous glucoside accompanying helleborin in several species of hellebore, and extracted as a white crystalline substance with a bitter…
  1. 1.
    A poisonous glucoside accompanying helleborin in several species of hellebore, and extracted as a white crystalline substance with a bittersweet taste. It has a strong action on the heart, resembling digitalin.(Chem.)