methacholine

noun
metha·​cho·​line | \ˌmeth-ə-ˈkō-ˌlēn \

Medical Definition of methacholine 

: a parasympathomimetic drug administered in the form of its crystalline chloride C8H18ClNO2 especially to diagnose hypersensitivity of the bronchial air passages (as in asthma) — see mecholyl, provocholine

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