Source : Webster's Revised Unabridged Dictionary (1913)

Brackish \Brack"ish\, a. [See {Brack} salt water.]
   Saltish, or salt in a moderate degree, as water in saline
   soil.

         Springs in deserts found seem sweet, all brackish
         though they be.                          --Byron.

Source : WordNet®

brackish
     adj : slightly salty; "a brackish lagoon"; "the briny deep" [syn:
           {briny}]