Webster's English Dictionary

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naphthalene

naph.tha.lene \-.le-n\ \.naf-th*-'le-n-ik, .nap-, -'len-\ n [alter. of 
   earlier naphthaline, irreg. fr. naphtha] : a crystalline aromatic 
   hydrocarbon C10H8 usu. obtained by di stillation of coal tar - 
   naph.tha.len.ic aj