Caffein vs. Caffeine

Caffeinnoun

A white, bitter, crystallizable substance, found in coffee and tea. It is identical with the alkaloid theine from tea leaves, and with guaranine from guarana. It is responsible for most of the stimulating effect of coffee or tea.

Caffeinenoun

An alkaloid, C₈H₁₀N₄O₂, found naturally in tea and coffee plants which acts as a mild stimulant on the central nervous system.

Caffeinnoun

a bitter alkaloid found in coffee and tea that is responsible for their stimulating effects

Caffeinenoun

a bitter alkaloid found in coffee and tea that is responsible for their stimulating effects

Caffeine

Caffeine is a central nervous system (CNS) stimulant of the methylxanthine class. It is the world's most widely consumed psychoactive drug.