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.
When the snake shows up as your spirit animal, it generally means: 1  Snake spirit animals represent healing. 2  Transformation, life changes. 3  The spirit of the snake is connected to life force, primal energy.  A meaning for the snake spirit animal is spiritual guidance.