One of the mysteries of the English language finally explained.
Each of the three compounds that can be formed by replacing one or more of the hydrogen atoms in ammonia with a methyl group or groups; especially CH₃NH₂ (monomethylamine), a colourless, flammable gas with a fishy or ammonia-like odour.
Mid 19th century; earliest use found in Philosophical Transactions of the Royal Society of London. From French méthylamine from methyl + amine.
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