Definition of ESTRUS. : a regularly recurrent state of sexual excitability during which the female of most mammals will accept the male and is capable of conceiving: heat; also: a single occurrence of this state. See estrus defined for kids.
1. (medicine) any of various liquids sold as medicine (as by a travelling medicine show) but medically worthless. 2. communication (written or spoken) intended to deceive. Familiarity information: SNAKE OIL used as a noun is rare. Dictionary entry details.
literally rock oil it is a general term for crude oil and natural gas primary source of automotive fuels and lubricant oils petroleum is a complex mixture of hydrocarbons and paraffins in some areas and aromatics and cyclo paraffins in other areasn most oil fields oil and natural gas occur together gas being the top layer on crude oil under which may lie water one barrel of petroleum equals 5604 cubic feet of natural gas 1 45 barrels of liquefied natural gas lng or about one barrel of gas oil