From BiblePortal Wikipedia

King James Dictionary [1]

Salt'Ness, n.

1. The quality of being impregnated with salt as the saltness of sea water or of provisions. 2. Taste of salt.

Webster's Dictionary [2]

(n.) The quality or state of being salt, or state of being salt, or impregnated with salt; salt taste; as, the saltness of sea water.