Definition of acenaphthylene in English:
acenaphthylene
noun ˌasɪˈnapθɪliːnˌasɪˈnafθɪliːn
Chemistry A crystalline aromatic hydrocarbon found in coal tar and tobacco smoke.
Origin
Late 19th century; earliest use found in Chemical News. From ace- + naphtha + -yl + -ene, after German Acenaphtylen.