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.
View All. There's snake oil, and then there's snake oil. When you hear the term snake oil you probably think of fake medicine. And if you are old enough, you might remember back to the days of cowboy movies when a man calling himself a doctor, would arrive in town with a wagon full of elixirs..