heptane

noun
hep·​tane | \ˈhep-ˌtān \

Definition of heptane 

: any of several isomeric alkanes C7H16 especially : the liquid normal isomer occurring in petroleum and used especially as a solvent and in determining octane numbers

First Known Use of heptane

1877, in the meaning defined above

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The first known use of heptane was in 1877

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