caffeine
noun
a white, crystalline, bitter alkaloid, C 8 H 10 N 4 O 2 , usually derived from coffee or tea: used in medicine chiefly as a nervous system stimulant.
caffein
-
a variation of
caffeine.
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Afterwards, as though in defense of his professional reputation, Dr. Sirovich said: "Had I had any medication, such as caffein, sodium benzoate, nitroglycerine, adrenalin or oxygen, I perhaps could have helped him."
From Time Magazine Archive
There are thousands of people, however, who like coffee, but who feel that they should not drink it with the caffein in it.
From Time Magazine Archive
Besides caffein, both tea and coffee contain an astringent known as tannic acid.
From Joseph Smith as Scientist A Contribution to Mormon Philosophy by John Andreas Widtsoe
Some of the French and German investigators have reported coffee from these regions that was absolutely devoid of caffein.
From All About Coffee by William H. (William Harrison) Ukers
It is true that caffein had been found in coffee and tea a few years before the revelation of 1833, but the physiological action of the drug was not known until many years afterwards.
From Joseph Smith as Scientist A Contribution to Mormon Philosophy by John Andreas Widtsoe
