Caffeine n. : A white, bitter, crystallizable substance, obtained from coffee. It is identical with the alkaloid theine from tea leaves, and with guaranine from guarana.

Example:
How to remove Caffeine or sugar from a beverage without destroying the Caffeine or the beverage?

Taxonomy
caffeine, coffee, adenosine, adenosine receptors, tolerance, tea, effects of caffeine, milligrams, the brain, receptors, caffeine intoxication, caffeine consumption, fl oz, plants, doses, evidence, body, caffeine intake.

Defination from the web:
caffeine includes information on the history, effects, pharmacology, and extraction methods of pure caffeine.