■ noun
1》 a stretch of salt water separated from the sea by a low sandbank or coral reef.
2》 N. Amer. & Austral./NZ a small freshwater lake near a larger lake or river.
3》 an artificial pool for the treatment of effluent or to accommodate an overspill from surface drains.
Derivatives
~al adjective
Origin
C17: from Ital. and Sp. laguna , from L. lacuna (see lacuna ).