Equarius, rij, m g. Substantiuum. Solin. A horse breaker.Equaria æ, f g. Varr. An heard of horses and mares.Equiferus pen. cor. Plin. A wild horse.
Lewis and Short: Latin dictionary
ĕquārĭus, a, um, adj. [id.], of or belonging to horses (very rare). I.Adj.: medicus,
a farrier
, Val. Max. 9, 15, 2.—II.Subst.A. ĕquārius, ii, m., a stableboy, groom, Sol. 45, 8.—B. ĕquāria, ae, f. (sc. res), a stud of horses: grandes, Varr. R. R. 2, prooem. 6.