1. a shallow body of water separated from a larger body of water by sandbars, coral reefs, or barrier islands
2. an artificial pool for the treatment or storage of sewage or industrial waste
Usage: technical

Examples

• The blue lagoon was surrounded by white sandy beaches.
• Fish swam in the shallow waters of the tropical lagoon.
• A coral reef protected the lagoon from the ocean waves.
• The resort featured a beautiful lagoon-style swimming pool.
• The sewage treatment plant used a lagoon system to process waste.
• Flamingos gathered at the edge of the salt lagoon.
• We kayaked through the peaceful lagoon at sunset.