One of the mysteries of the English language finally explained.
Each of six isomeric compounds, C₁₀H₆O₂, notionally obtained by replacing two of the ≧CH groups of naphthalene by carbonyl groups; specifically (more fully "1,4-naphthoquinone", "α-naphthoquinone") a volatile yellow solid whose molecule forms part of the structure of vitamin K.
Late 19th century; earliest use found in Journal of the Chemical Society. From naphtha + -o- + quinone.
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