IPA: /ˈsɔːlt.nəs/
KK: /ˈsɔlt.nəs/
The condition of having a lot of salt in something, often used to describe the taste of food or the nature of water.
The saltness of the ocean water makes it unsuitable for drinking.
Saltness is formed from "salt" (from Old English *sealt*, meaning a mineral substance used for seasoning and preserving food) and "-ness" (meaning a state or quality of). The word "saltness" refers to the quality or state of being salty.
Think of the mineral substance used for seasoning food ('salt') and the quality of that substance ('-ness') to remember that 'saltness' means the quality of being salty.