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ornamental stone, 1721, earlier iada (1590s), from French le jade, error for earlier l'ejade, from Spanish piedra de (la) ijada (1560s), "stone of colic, pain in the side" (jade was thought to cure this), from Vulgar Latin *iliata, from Latin ilia (plural) "flanks, kidney area" (see ileum).
"worn-out horse," late 14c., "cart horse," of uncertain origin. Barnhart suggests a variant of yaid, yald "whore," literally "mare," from a Scandinavian source akin to Old Norse jalda "mare," from Finno-Ugric (cf. Mordvin al'd'a "mare"). But OED finds the assumption of a Scandinavian connection "without reason." As a term of abuse for a woman, it dates from 1550s.