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Definitions for Alkaloid

[1] any of a large class of organic, nitrogen-containing ring compounds of vegetable origin and sometimes synthesized, some of which are liquid but most of which are solid, that have a bitter taste, that are usually water-insoluble and alcohol-soluble, that combine with acids without the loss of a water molecule to form water-soluble hydrochlorides, hydrobromides, or the like, and that usually exhibit pharmacological action, as nicotine, morphine, or quinine.
[2] resembling an alkali; alkaline.
[3] any of a group of nitrogenous basic compounds found in plants, typically insoluble in water and physiologically active. Common examples are morphine, strychnine, quinine, nicotine, and caffeine

Words nearby Alkaloid

alkaline-ash diet, alkaline-earth metal, alkalinity, alkalinuria, alkalize, alkaloid, alkaloidal, alkalosis, alkaluria, alkane, alkane series

Origin of Alkaloid

First recorded in 1825–35; alkal(i) + -oid

Other words from Alkaloid

non·al·ka·loid , noun, adjective