Medical Dictionary


noun al·ka·loid \ˈal-kə-ˌlid\

Medical Definition of ALKALOID

:  any of numerous usually colorless, complex, and bitter organic bases (as morphine or caffeine) containing nitrogen and usually oxygen that occur especially in seed plants and are typically physiologically active
al·ka·loi·dal \ˌal-kə-ˈlid-əl\ adjective
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