Midras uncleanness

Midras uncleanness (Hebrew: טומאת מדרס) is one of the forms of ritual impurity in Judaism which can be transmitted by either an object or person. The term may be translated as pressure uncleanness.

A midras (lit. "trampled on" object) is an object that can be a carrier of ritual impurity. Common objects that could potentially become unclean, and become a such midras object, include a chair, sofa, mattress, and rug. A person who becomes unclean is categorized as a "father of uncleanliness".