Lewis & Short

ōcĭnum (also ōcĭmum, ōcymum, and ōzymum), i, n., = ὤκινον, an herb which serves for fodder, perh. a sort of clover, Cato, R. R. 54; Varr. R. R. 1, 31; Plin. 17, 22, 35, § 198; 18, 16, 42, § 143.