Lewis & Short

sūdārĭum, ii, n. [sudor], a cloth for wiping off perspiration, a handkerchief, Cat. 12, 14; 25, 7; Mart. 11, 39, 3; Petr. 67: sudario candido tergere frontem, Quint. 6, 3, 60; 11, 3, 148; Suet. Ner. 25; 48; 51; Val. Max. 9, 12, 7; App. Mag. p. 309, 28.