Saltwater (noun)

1. Water containing a high concentration of salt, such as that found in oceans, seas, and some large lakes.
2. Water that has a higher salt content than fresh water.

Origin:

Early 19th century: from salt + water.

Examples:

1. Saltwater is denser than fresh water.
2. Saltwater contains many different types of dissolved minerals.
3. Saltwater is used in many industrial processes.
4. Saltwater is also used for swimming pools and spas.
5. Saltwater fish require a different type of water than freshwater fish.