Cite
 

Meaning of alkaloid

al•ka•loid

Pronunciation: (al'ku-loid"), [key]
— Biochem., Chem., Biochem.,Chem.,Pharm.
—n.
  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.
—adj.
  1. resembling an alkali; alkaline.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
See also: