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

alkaloid

noun
 
/ˈælkəlɔɪd/
 
/ˈælkəlɔɪd/
(biology or medical)
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  1. 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 alkaloid in the Oxford Advanced American Dictionary
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noun
 
 
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