noun Chemistry, Pharmacology.
Related formscaf·fein·ic [ka-fee-nik, kaf-ee-in-ik] /kæˈfi nɪk, ˌkæf iˈɪn ɪk/, adjectivenon·caf·feine, nounnon·caf·fein·ic, adjective
Examples from the Web for caffein
The symptoms were the same as those observed in cats and rabbits after the administration of caffein.
Two of the animals were seized with convulsions half an hour after the introduction of caffein and died during the attack.
Symptoms appeared in from 10 to 15 minutes after the injection of caffein.
This compound is water-soluble, but caffein can not be extracted from the crystals with anhydrous solvents.All About Coffee|William H. Ukers
Two others died during the night, while one lived 25 hours after the injection of caffein.