noun
: an oil obtained from oil shale by heating usually in retorts : the crude dark green to brown oil from the first distillation that on refining yields liquid fuels and other useful products
noun
: an oil obtained from oil shale by heating usually in retorts : the crude dark green to brown oil from the first distillation that on refining yields liquid fuels and other useful products
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012