ace·​naph·​thene | \ˌasəˈnapˌthēn, -afˌth-\
plural -s

Definition of acenaphthene 

: a crystalline tricyclic hydrocarbon C12H10 obtained especially from coal tar and used chiefly as a dye intermediate and in biology for inducing polyploidy

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First Known Use of acenaphthene

1868, in the meaning defined above

History and Etymology for acenaphthene

International Scientific Vocabulary ace- + naphthene

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The first known use of acenaphthene was in 1868

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to make faulty or ineffective

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