ace·naph·thy·lene
| \ -thəˌlēn \
plural -s
Definition of acenaphthylene
: a yellowish crystalline hydrocarbon C12H8 made by dehydrogenation of acenaphthene
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Merriam-Webster unabridged
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Time Traveler for acenaphthylene
The first known use of acenaphthylene was in 1877
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