Definition of methacholine in English:

methacholine

Pronunciation /mɛθəˈkəʊliːn/

noun

Pharmacology
  • A choline derivative with parasympathomimetic activity that can induce bronchoconstriction in asthmatics and is used in tests of airway responsiveness; O -acetyl-β-methylcholine, C ₈ H ₁₈ ClNO ₂.

Origin

1940s; earliest use found in Science. From meth- (in methyl see note s.v. meth-) + -a- connective + choline.