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Ritalin (n.)

central nervous system stimulant, a proprietary name (Ciba Ltd., originally in Switzerland) for the drug methylphenidate hydrochloride. It was trademarked 1948, years before the drug itself was marketed.

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Definitions of Ritalin from WordNet

Ritalin (n.)
central nervous system stimulant (trade name Ritalin) used in the treatment of narcolepsy in adults and attention deficit disorder in children;
Synonyms: methylphenidate
From wordnet.princeton.edu