Lewis & Short

quā̆drīmus, a, um, adj. [quattuor and root ghim-, him-, of Sanscr. himas, snow; cf. Gr. χιών, χεῖμα; Lat. hiems, hibernus; hence, of four winters], of four years, four years old (class.): de quadrimo Catone, of Cato of Utica, when four years old, Cic. Fam. 16, 22, 1; cf.: infantem natum esse quadrimo parem, Liv. 27, 37: boves, Varr. R. R. 1, 20, 5: merum, Hor. C. 1, 9, 7: vitis, Col. 4, 16, 1: dies, a term of four years, Dig. 23, 4, 19: equae, Plin. 8, 44, 69, § 171.