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Etymology from Wiktionary, CC BY-SA 4.0.
Today it means: Any of several isomeric naphthylvinyl derivatives of pyridine, but especially 4-[(E)-2-naphthalen-1-ylethenyl]pyridine which has anticholinergic activity similar to that of atropine Full definition →
Etymology from Wiktionary, CC BY-SA 4.0.