from
The Collaborative International Dictionary of English v.0.48
lagoon \la*goon"\ (l[.a]*g[=oo]n"), n. [It. or Sp. laguna, L.
lacuna ditch, pool, pond, lacus lake. See {Lake}, and cf.
{Lacuna}.] [Written also {lagune}.]
1. A shallow sound, channel, pond, or lake, especially one
into which the sea flows; as, the lagoons of Venice.
[1913 Webster]
2. A lake in a coral island, often occupying a large portion
of its area, and usually communicating with the sea. See
{Atoll}.
[1913 Webster]
{Lagoon island}, a coral island consisting of a narrow reef
encircling a lagoon.
[1913 Webster] Lagophthalmia