# methacholine

> English word · Noun · IPA /mɛθ.əˈkəʊ.liːn/

## Definitions
1. A choline derivative with parasympathomimetic activity that can induce bronchoconstriction in asthmatics and is used in tests of airway responsiveness; O-acetyl-β-methylcholine, C₈H₁₈NO₂⁺.

## Etymology
From meth(yl) + -a- + choline.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/methacholine