I. Of or pertaining to a door-hinge: “scapi,” Vitr. 4, 6, 4.—
II. Trop., that on which something turns, depends, i. e. principal, chief: venti, the principal or cardinal winds, Serv. ad Verg. A. 1, 131; Isid. Orig. 13, 11, 14; cf. virtutes, Hier ap. Macr. S. 1, 16-19; Ambros. ap. Luc. 5, § 49 al.—Hence, in late Lat.: cardinalia Christi opera, Cypr.—
B. Esp.
1. As eccl. term; subst., a chief presbyter, as opp. to one who ministered in an Oratorium; and esp. of such forming the council of the Pope at Rome, which afterwards consisted only of bishops, cardinals, Anast. p. 95.—