Definition of alkaloid in English:

alkaloid

Syllabification: al·ka·loid
Pronunciation: /ˈalkəˌloid
 
/

noun

Chemistry
  • Any of a class of nitrogenous organic compounds of plant origin that have pronounced physiological actions on humans. They include many drugs (morphine, quinine) and poisons (atropine, strychnine).
    More example sentences
    • Other important alkaloids are caffeine, ricinine, and quinine.
    • Morphine is an alkaloid, meaning that it is an organic compound that contains carbon, hydrogen and nitrogen, and forms a water-soluble salt.
    • This material is a complex mixture of about 20 different alkaloids or nitrogen containing organic bases.

Origin

early 19th century: coined in German from alkali.

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