an area of shallow water separated from the sea by low sandy dunes. Compare laguna .

Also, lagune. any small, pondlike body of water, esp. one connected with a larger body of water.

an artificial pool for storage and treatment of polluted or excessively hot sewage, industrial waste, etc.

noun

bayou , gulf , marsh , pond , pool , shallows , shoal , tidal pondnotes:a lagoon is a shallow pond near a body of water; a long lagoon near the sea is a haff