Lewis Short
quartārĭus (noun M) : id..
* A fourth part, quarter of any measure, esp. of a sextarius, a quartern, gill: sumito bituminis tertiarium, et sulphuris quartarium,Cato, R. R. 95, 1: vini,Liv. 5, 47: mellis,Col. 12, 5, 1: farris,Plin. 18, 3, 3, § 9.
* A mule-driver, muleteer, who received a fourth part of the profits, Lucil. ap. Fest. p. 258 Müll.
Charlton T. Lewis, Charles Short, A Latin Dictionary