Caffeine, caffein n. (Chem.) 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.
... of glasses of semicircular shape, like half-moons with the horns turned up. Behind these, Mr. McCall's eyes played a perpetual game of peekaboo, now peering over them, anon ducking down and hiding behind them. He was sipping a cup of anti-caffeine. On his right, toying listlessly with a plateful of cereal, sat his son, Washington. Mrs. McCall herself was eating a slice of Health Bread and nut butter. For she practised as well as preached the doctrines which she had striven for so many years to inculcate ... — Indiscretions of Archie • P. G. Wodehouse
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