methacholine
noun
metha·cho·line
ˌmeth-ə-ˈkō-ˌlēn 
: 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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“Methacholine.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/methacholine. Accessed 8 Feb. 2025.
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