Av HaTumah

In the realm of tumah and taharah terminology, the term Av HaTumah (father of tumah, or simply Av) is a rabbinic term used to define a person or object that is in a state of tumah (ritual impurity) to the second degree. A person or object that is a Av HaTumah has the ability to transfer its tumah to another person or object (usually at a downgrade...
Found on http://en.wikipedia.org/wiki/Av_HaTumah
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