mid-15c., from salt, n. + saler "salt-cellar" (14c.), from Old French salier "salt box" (Modern French salière), from Latin salarium, noun use of adjective meaning "pertaining to salt," from a diminutive of Latin sal "salt." As the connection between *saler and "salt" was lost, salt- was tacked on to the beginning; second element altered on model of cellar.