methylnaphthalene

noun meth·yl·naph·tha·lene \ˌme-thəl-ˈnaf-thə-ˌlēn, -ˈnap-\

Definition of METHYLNAPHTHALENE

: either of two isomeric hydrocarbons C₁₁H₁₀; especially : an oily liquid used in determining cetane numbers

circa 1885

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