1. 
   alkaloids
   Alkaloids are basic nitrogen organic compounds (mostly heterocyclic) derived from plants and having diverse pharmacological properties. Alkaloids include morphine, cocaine, atropine, quinine, and caffeine, most of which are used in medicine as analgesics or anaesthetics. Some alkaloids are poisonous...
   Found op http://www.ktf-split.hr/periodni/en/abc/a.html
   
   
2. 
   alkaloids
   Organic nitrogenous bases. Many alkaloids of medical importance occur in the animal and vegetable kingdoms, and some have been synthesised. ... (12 Dec 1998) ...
   Found op http://www.mondofacto.com/facts/dictionary?alkaloids
   
   

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