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[meth-uh l-naf-thuh-leen, -nap-] /ˌmɛθ əlˈnæf θəˌlin, -ˈnæp-/

noun, Chemistry.
a compound, C 1 1 H 1 0 , whose alpha isomer, a colorless liquid, is used in determining cetane numbers.
either of two isomeric derivatives of naphthalene: a liquid (1-methylnaphthalene), used in standardizing diesel fuels, or a solid (2-methylnaphthalene), an insecticide


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