Lewis & Short

ĕquārĭus, a, um, adj. [equus], of or belonging to horses (very rare).

  1. I. Adj.: medicus, a farrier, Val. Max. 9, 15, 2.
  2. II. Subst.
    1. A. ĕquārius, ii, m., a stableboy, groom, Sol. 45, § 8.
    2. B. ĕquāria, ae, f. (sc. res), a stud of horses: grandes, Varr. R. R. 2, prooem. § 6.