A cancer that involves the mouth floor. The disease is MONDO_0021320 (malignant tumor of floor of mouth). Also known as: cancer of mouth floor, malignant floor of mouth neoplasm, malignant floor of mouth tumor, malignant floor of mouth tumour, malignant floor of the mouth neoplasm, malignant floor of the mouth tumor, malignant floor of the mouth tumour, malignant mouth floor neoplasm.