Ăt'ro-pine, n.

n. [N. Lat. atropa, Linn., Gr. ἄτροπος, -ον, inflexible; hence Ἄτροπος, one of the three Parcae, from ἀ priv. and τρέπειν, to turn.] (Chem.) A very poisonous vegetable alkaloid, extracted from the Atropa belladonna, or deadly nightshade. It is white, brilliant, and crystallizes in long needles.