One of the mysteries of the English language finally explained.
Either of two isomeric monovalent radicals, C₁₀H₇—, derived from naphthalene. Usually attributive or as a formative in chemical names.
Mid 19th century; earliest use found in Proceedings of the Royal Society of London. From naphth- + -yl. With form naphtyl perhaps compare French naphtyl-, combining form, naphtyle, noun.
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