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

plural of caffeine

Related to or containing caffeine.

(informal) One who consumes caffeine. / (informal) A distributor of caffeinated beverages.

plural of caffeinator

a toxic condition caused by excessive ingestion of coffee and other caffeine-containing beverages / addiction to such beverages

Containing caffeine naturally (e.g., coffee, tea, and cacao) or as an additive (e.g., soft drinks, sports drinks, or energy drinks).

simple past tense and past participle of caffeinate

plural of caffein

(transitive) To add caffeine to. / (intransitive, slang) To drink caffeinated beverages in order to increase one's energy or wakefulness or to enhance physical or mental performance.