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alkaloid Line breaks: al¦kal|oid
Pronunciation: /ˈalkəlɔɪd/

Definition of alkaloid in English:


Any of a class of nitrogenous organic compounds of plant origin which have pronounced physiological actions on humans. They include many drugs (morphine, quinine) and poisons (atropine, strychnine).
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.


Early 19th century: coined in German from alkali.

Words that rhyme with alkaloid

celluloid • mongoloid
Definition of alkaloid in:
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