Source : Webster's Revised Unabridged Dictionary (1913)

Hydrosalt \Hy"dro*salt`\, n. [Hydro-, 1 + salt.] (Chem.)
   (a) A salt supposed to be formed by a hydracid and a base.
   (b) An acid salt. [R.]
   (c) A hydrous salt; a salt combined with water of hydration
       or crystallization.