Dictionary.net

• A white, saline substance, which is a Hindoo preparation of great antiquity, and has been supposed to be the Sal asphalti'tes and Sal Sodome'nus of the ancients. It is used by the Hindoo in the prevention or cure of almost all diseases.

1846 - Medical lexicon: a dictionary of medical science
By Robley Dunglison

• An East Indian panacea containing salt, iron, and an astringent.

1898 - American pocket medical dictionary
By Willam Alexander Newman Dorland