Množina: lagoons

ETYM Italian or Spanish laguna, Latin lacuna ditch, pool, pond, lacus lake. Related to Lake, Lacuna.
A body of water cut off from a larger body by a reef of sand or coral; SYN. laguna, lagune.
Coastal body of shallow salt water, usually with limited access to the sea. The term is normally used to describe the shallow sea area cut off by a coral reef or barrier islands.