sal n.

Proto-Indo-European root meaning "salt."

It forms all or part of: hali-; halide; halieutic; halite; halo-; halogen; sal; salad; salami; salary; saline; salmagundi; salsa; salsify; salt; salt-cellar; saltpeter; sauce; sausage; silt; souse.

It is the hypothetical source of/evidence for its existence is provided by: Greek hals "salt, sea;" Latin sal, Old Church Slavonic soli, Old Irish salann, Welsh halen, Old English sealt, German Salz "salt."

volatile alkali, a colorless gas with a strong pungent smell, 1799, coined in scientific Latin 1782 by Swedish chemist Torbern Bergman as a name for the gas obtained from sal ammoniac, salt deposits containing ammonium chloride found near temple of Jupiter Ammon in Libya (see Ammon, and compare ammoniac). The shrine was ancient already in Augustus' day, and the salts, traditionally, first were prepared from mineral deposits "from the sands where the camels waited while their masters prayed for good omens" [Shipley, "Origins of English Words"]. Also known as spirit of hartshorn and volatile alkali or animal alkali.

1590s "fine or light," also "evaporating rapidly" (c. 1600), from French volatile, from Latin volatilis "fleeting, transitory; swift, rapid; flying, winged," from past participle stem of volare "to fly" (see volant). Sense of "readily changing, flighty, fickle" is first recorded 1640s. Volatiles in Middle English meant "birds, butterflies, and other winged creatures" (c. 1300).