Severe cellulitis of the submaxillary space with secondary involvement of the sublingual and submental space. It usually results from infection in the lower molar area or from a penetrating injury to the mouth floor. (From Dorland, 27th ed). The disease is Ludwig's angina (MONDO_0006576, a Monarch Disease Ontology identifier). Also known as: Ludwig angina, cellulitis (disease) of mouth floor, cellulitis of floor of mouth, mouth floor cellulitis (disease).