Any of a class of compounds produced in plant tissues that are distasteful, toxic and/or poisonous to herbivores; many also exhibit a pharmacological action, as in caffeine, cocaine, nicotine, morphine and quinine.
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allochemical (... , plant defensive chemical. See alkaloid.)
colchicine (Alkaloid chemical that disrupts the mitotic spindle; used to collect cells suspended by ...)
quinine (White crystalline powder, the principal alkaloid of cinchona bark, used in the treatment of ...)
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From "Dictionary of Nursing and Individual Health Care"