One of the mysteries of the English language finally explained.
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".
1950s; earliest use found in The Lancet. From -methonium.
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