an area of shallow water separated from the sea by low sandy dunes. Compare laguna.
Also, lagune. any small, pondlike body of water, especially one connected with a larger body of water.
an artificial pool for storage and treatment of polluted or excessively hot sewage, industrial waste, etc.

1605–15; earlier laguna (singular), lagune (plural) < Italian < Latin lacūna (singular), lacūnae (plural) ditch, pool, akin to lacus basin, lake1; see lacuna

lagoonal, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
lagoon (ləˈɡuːn)
1.  a body of water cut off from the open sea by coral reefs or sand bars
2.  any small body of water, esp one adjoining a larger one
[C17: from Italian laguna, from Latin lacūna pool; see lacuna]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1612, from Fr. lagune, from It. laguna "pond, lake," from L. lacuna "pond, hole," from lacus "pond" (see lake). Originally in ref. to the region of Venice; applied 1769 to the lake-like stretch of water enclosed in a South Seas atoll.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
lagoon   (lə-gn')  Pronunciation Key 
  1. A shallow body of salt water close to the sea but separated from it by a narrow strip of land, such as a barrier island, or by a coral reef.

  2. A shallow pond or lake close to a larger lake or river but separated from it by a barrier such as a levee.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
It is sharing technical knowledge on sewage-lagoon management, water-quality
  monitoring, and recycling.
In summer, the lagoon bordering the central business district smells of sewage.
We lowered two red skiffs from our research vessel, loaded our diving gear, and
  sped off toward the lagoon.
Landscapers built a lagoon for koi carp and swans that would be sustained with
  reclaimed wastewater generated by guests.
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