[Pers. nafata, to exude.] A volatile bituminous liquid, of a strong peculiar smell, and very easily set on fire. When occurring naturally it is called rock oil or crude petroleum, and it is also obtained in the refinement ofpetrol-eum. It is used for illumination and to dissolve varnishes, etc. Coal naphtha is obtained by the distillation of ,coal tar, boghead naphtha from coal, and wood naphtha from wood.