I.a rubbing on or against something (post-Aug.).
I. In gen.: “(sues) inter se dimicant indurantes attritu arborum costas,” Plin. 8, 52, 78, § 212; 9, 45, 68, § 147; 16, 40, 77, § 208; 37, 3, 12, § 48; Sen. Ira, 3, 4.—
II. Med. t., an inflammation of the skin caused by rubbing (cf. attero, P a.): “ulcera ex attritu facta,” Plin. 33, 6, 35, § 105; 26, 8, 58, § 91 (Jan, trita); 28, 16, 62, § 222.