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
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