Lewis & Short

2. vēnus, ūs, m., or vēnum (vaen-), i, n. (occurring only in the forms venui, veno, and venum) [Gr. ὦνος, price; ὠνή, purchase; cf. Sanscr. vasuas, price; vasuam, wages; and perh. Germ. Gewinn], sale.

      1. a. Dat.
        1. (α) Form venui (late Lat.): rogavit haberetne venui lacte? App. M. 8, p. 210, 12: cantherium venui subicere, id. ib. 8, p. 221, 29.
        2. (β) Form veno (post-Aug.): posita veno irritamenta luxus, Tac. A. 14, 15: quae veno exercerent, id. ib. 13, 51.
      2. b. Acc. venum (class.): dare aliquem venum, to sell, Liv. 24, 47, 6: venum cuncta dari, Claud. in Rufin. 1, 179; hence the compound venumdo, q. v.: ut ejus familia ad aedem Cereris venum iret, Liv. 3, 55, 7: pileatos servos venum solitos ire, Gell. 7, 4, 1: venum iturum, Sen. Const. 3, 2: seque et sua tradita venum Castra videt, Luc. 4, 206: venum redibat, Claud. in Eutr. 1, 37.