Standard Lemma guide

methacholine

noun · 2 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.

  • Received-Pronunciation: /mɛθ.əˈkəʊ.liːn/
  • General-American: /ˌmɛθ.əˈkoʊˌlin/

1

noun

Meaning 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+.

Definition source: English Wiktionary via Wiktextract

Usage: uncountable

Topics: medicine, pharmacology, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

parasympathomimetic drug (trademark Mecholyl) that stimulates secretions and smooth muscle activity

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: Mecholyl

Antonyms: none provided

Broader terms: medicine, medication, medicament, medicinal drug

History

Etymology

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

Across languages

Translations

1 source translations are retained for this English entry.

  • Czech: metacholin — synthetic choline ester