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.
Mineral oil is used to  distinguish oily substances that came out of the ground from oily  substances that are derived from plant â¦ s or animals. The mineral  in this case is petroleum, the substance from which  mineral oil is derived.(Petroleum simply means stone oil in  Greek).   Mineral oil is mainly a mixture of alkane hydrocarbons. If that  sounds a lot like gasoline, it is ...he mineral  in this case is petroleum, the substance from which  mineral oil is derived. (Petroleum simply means stone oil in  Greek).    Mineral oil is mainly a mixture of alkane hydrocarbons.