quā̆drĭjŭgis, e, adj. [quattuor-iugum],
of or belonging to a team of four (poet. and post-Aug.): equi, Verg. A. 10, 571: currus, Ap. Flor. 3, p. 356, 14.
quadriiugis e, adj.quattuor+iugum, of a team of four : equi, V. ...
An Elementary Latin Dictionary