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.
Flammable liquid consisting of hydrocarbons found underneath underground. Crude oil is recovered through oil drilling and refined into usable products such as gasoline, heating oil, kerosene, diesel, among others. Crude oil is often described as heavy or light to indicate the proportion of hydrocarbons (heavier meaning more).