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

First Known Use of methylnaphthalene

circa 1885, in the meaning defined above

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The first known use of methylnaphthalene was circa 1885

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