Google Share on Facebook methylphenidate (redirected fromMetadate) Thesaurus Medical Related to Metadate:Metadate cd meth·yl·phen·i·date (mĕth′əl-fĕn′ĭ-dāt′, -fē′nĭ-) n. A drug, C14H19NO2, chemically related to amphetamine, that acts as a mild stimulant of the cen...