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
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
The caffein in the roasted coffee is not as tightly bound chemically as in the green coffee, and is, therefore, more easily extracted.
From All About Coffee by William H. (William Harrison) Ukers
This acid compound of caffein will be largely decomposed during the process of torrefaction, so that in roasted coffee a larger percentage will be present in the free state.
From All About Coffee by William H. (William Harrison) Ukers
