n.a medical dressing consisting of a soft heated mass of meal or clay that is spread on a cloth and applied to the skin to treat inflamed areas or improve circulation etc.
N-COUNT
A poultice is a piece of cloth with a soft, often hot, substance such as clay or a mixture of herbs on it. It is put over a painful or swollen part of someone's body in order to reduce the pain or swelling. 膏药; 泥敷剂