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 an industrially produced derivative of crude oil. This is the very same oil that many of you put into your car as petroleum. The crude oil undergoes a process of purification, until it is refined into a slippery fluid, ready to be used in a variety of cosmetics. The problem with this process is that crude oil contains many toxins and carcinogenic materials. If properly distilled, these should in theory be removed from mineral oil.