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From [Term?] + -mantadine (“adamantane derivative”).
Etymology from Wiktionary, CC BY-SA 4.0.
rimantadine
Today it means: A synthetic antiviral drug that is chemically related to amantadine and is administered orally in the form of its hydrochloride C₁₂H₂₁N·HCl in the prevention and treatment of influenza A; 1-(1-adamantyl)ethanamine. Full definition →