1650s, "offered for sale, capable of being obtained for a price," from French vénal, from Latin venalis "that is for sale," from venum (nominative *venus) "for sale," from PIE root *wes- "to buy, sell" (cf. Sanskrit vasnah "purchase money," vasnam "reward," vasnayati "he bargains, haggles;" Greek onos "price paid, purchase," oneisthai "to buy").