Definition of methonium in US English:

methonium

noun

Pharmacology
  • Any of a class of compounds consisting of a methylene chain with a trimethylammonium group, (CH₃)₃N+, at each end, some of which are used as ganglionic blocking agents; a salt of such a compound. Chiefly attributive, especially in "methonium compound".

Origin

1950s; earliest use found in The Lancet. From -methonium.

Pronunciation

methonium

/mɛˈθəʊnɪəm/