1650s, "offered for sale, capable of being obtained for a price," from Fr. vénal, from L. venalis "that is for sale," from venum (nom. *venus) "for sale," from PIE base *wes- "to buy, sell" (cf. Skt. vasnah "purchase money," vasnam "reward," vasnayati "he bargains, haggles;" Gk. onos "price paid, purchase," oneisthai "to buy").