[ka-feen, kaf-een, kaf-ee-in] 
| a white, crystalline, bitter alkaloid, C8H10N4O2, usually derived from coffee or tea: used in medicine chiefly as a nervous system stimulant. |
| caf·feine also caf·fein (kā-fēn', kāf'ēn', kāf'ē-ĭn) n. A bitter white alkaloid, C8H10N4O2, often derived from tea or coffee and used in medicine chiefly as a mild stimulant and to treat certain kinds of headache. [German Kaffein (from Kaffee, coffee) or French caféine, both from French café, coffee; see café.] caf'fein·at'ed (kāf'ə-nā'tĭd) adj. |
caffeine caf·feine or caf·fein (kā-fēn', kāf'ēn', kāf'ē-ĭn)
n.
A bitter white alkaloid often derived from tea or coffee and used chiefly as a mild stimulant and in the treatment of certain kinds of headache.
| caffeine (kā-fēn') Pronunciation Key
A bitter white alkaloid found in tea leaves, coffee beans, and various other plant parts. It is a mild stimulant. Caffeine is a xanthine and similar in structure to theobromine and theophylline. Chemical formula: C8H10N4O2. |
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