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.
crude oil is a naturally occurring, flammable liquid consisting of a complex mixture of hydrocarbons of various molecular weights, and other organic compounds, that are found in geologic formations beneath the earth's surface.Oil and gas are chemicals made from molecules containing just carbon and hydrogen.rude oil, also known as petroleum, is a mixture of hydrocarbons. In many cases it is already under pressure because of the weight of the ground on top of it, so if you drill â¦ a hole into the pocket of oil, the oil will come up by itself.