From Longman Dictionary of Contemporary Englishpotholderpot‧hold‧er /ˈpɒtˌhəʊldə $ ˈpɑːtˌhoʊldər/ noun [countable] DFUa piece of thick material that you use to protect your hands when you pick up a hot cooking pan
Examples from the Corpus
potholder• The unit looks like a bloated potholder, about 5 by 7 inches and little more than a inch thick. 