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.
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
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
This is not a suitable coffee for one desiring an almost caffein-free drink, for the empyreumatic products produced by this excessive roasting will be more toxic by far than the caffein itself would have been.
From All About Coffee by William H. (William Harrison) Ukers
If the roast be carried almost to the point of carbonization, as in the case of the "Italian roast," the caffein content will be almost nil.
From All About Coffee by William H. (William Harrison) Ukers
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
