The largest value in a collection in which each value corresponds to the length of a straight line passing through the center and connecting opposite points on the circumference of a circle circumscribing a single squamous cell tumor of the tongue. A squamous cell carcinoma of the tongue is a tumor arising in the tongue from the uncontrolled multiplication of cells of the epithelium, or of cells showing the particular cytological characteristics of squamous cell differentiation, such as the presence of keratin, tonofilament bundles, or desmosomes, structures involved in cell-to-cell adhesion. A tumor is an abnormal growth of tissue resulting from uncontrolled, progressive multiplication of cells and serving no physiological function. The tongue is the movable muscular organ on the floor of the mouth; it is the chief organ of taste, and aids in mastication, swallowing, and speech.