One of the mysteries of the English language finally explained.
A choline derivative with parasympathomimetic activity that can induce bronchoconstriction in asthmatics and is used in tests of airway responsiveness; O-acetyl-β-methylcholine, C₈H₁₈ClNO₂.
1940s; earliest use found in Science. From meth- (in methyl: see note s.v. meth-) + -a- connective + choline.
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