naphthalene
    n 1: a white crystalline strong-smelling hydrocarbon made from
         coal tar or petroleum and used in organic synthesis and as
         a fumigant in mothballs

Naphthalene \Naph"tha*lene\, n. (Chem.)
   A white crystalline aromatic hydrocarbon, C10H8, analogous
   to benzene, and obtained by the distillation of certain
   bituminous materials, such as the heavy oil of coal tar. It
   is the type and basis of a large number of derivatives among
   organic compounds. Formerly called also naphthaline.
   [1913 Webster]

   Naphthalene red (Chem.), a dyestuff obtained from certain
      diazo derivatives of naphthylamine, and called also
      magdala red.

   Naphthalene yellow (Chem.), a yellow dyestuff obtained from
      certain nitro derivatives of naphthol.
      [1913 Webster]