Seawater (noun)

Water from the sea, which contains a high concentration of salt.

Origin:

17th century: sea + water.

Examples:

1. The seawater was used by sailors to clean and preserve their food on long voyages.
2. The seawater was too salty to drink, and had to be distilled before it could be consumed.
3. The seawater was home to a rich diversity of marine life, from tiny plankton to massive whales.
4. The seawater was being polluted by human activities, such as oil spills, sewage discharge, and overfishing.
5. The seawater was studied by scientists, who were interested in its chemical composition and how it was affected by global warming.