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alkaloid (n.)

1831, from alkali (q.v.) + -oid. "A general term applied to basic compounds of vegetable origin, bitter in taste, and having powerful effects on the animal system" [Flood], including morphine and nicotine. As an adjective by 1859.

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Definitions of alkaloid from WordNet

alkaloid (n.)
natural bases containing nitrogen found in plants;
From wordnet.princeton.edu