Chem. Obs. [med.L., = ‘third salt.’] See quot.
1753. Chambers, Cycl. Supp., Tertium Sal, a third salt, a term used in chemistry to express a salt resulting from the mixture of an acid and an alkali, which partakes so of the nature of both, as to be itself neither acid nor alkali, but neutral.
1860. in Mayne, Expos. Lex.
