la·goon

[luh-goon]
noun
1.
an area of shallow water separated from the sea by low sandy dunes. Compare laguna.
2.
Also, lagune. any small, pondlike body of water, especially one connected with a larger body of water.
3.
an artificial pool for storage and treatment of polluted or excessively hot sewage, industrial waste, etc.

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

la·goon·al, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Lagoon is always a great word to know.
So is lollapalooza. Does it mean:
a gadget; dingus; thingumbob.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
Collins
World English Dictionary
lagoon (ləˈɡuːn) [Click for IPA pronunciation guide]
 
n
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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Etymonline
Word Origin & History

lagoon
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.
His patio features exotic furnishings, flamboyant plants, and the colors of a
  lush lagoon.
The uneven stone rim and creeping vegetation enhance the lazy lagoon mood.
The first lagoon is bubbly and dark, with anaerobic bacteria digesting the
  organic matter to reduce odor.
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