Definition of alkaloid noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈælkəlɔɪd//
; NAmE NAmE//ˈælkəlɔɪd//
(biology or medical)
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a poisonous substance found in some plants. There are many different alkaloids and some are used as the basis for drugs. Word Originearly 19th cent.: coined in German from alkali.
See the Oxford Advanced American Dictionary entry: alkaloid