the oily product, lighter than water, forming the chief part of the first distillate of coal tar, and consisting largely of benzene and toluene.
See also: Light
light oil
light oil
[′līt ¦ȯil] (materials) A coal tar fraction obtained by distillation; boiling range, 110-210°C; used as a source of benzene, toluene, phenol, and cresols. Also known as coal tar light oil.Any oil having a boiling range of 110-210°C.