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.
The symbol of the snake has many meanings: ignorance, energy, unhappiness or happiness(duality), death, time and change. In Indian mythology Lord Vishu rests on a thousand-headed snake and sends out the first vibration (Sphurna), from which the entire Universe evolves.. Vibration or movement is the feminine energy.