naphthadil (or ph as p)

[Eng. naphtha, second element doubtful; cf. dill (1), v.] Chem.: A substance derived from petroleum; it is black, with a weak, greasy luster; copper-brown in fracture; does not change in the light, melts at the same temperature as wax, and burns with a IMG:content-1558.png:[blocks in formation] naphthalene