Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A shallow body of water, especially one separated from a sea by sandbars or coral reefs.
  • n. A shallow body of liquid waste material, as one in a dump.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A shallow body of water separated from deeper sea by a bar.

from the GNU version of the Collaborative International Dictionary of English

  • n. A shallow sound, channel, pond, or lake, especially one into which the sea flows.
  • n. A lake in a coral island, often occupying a large portion of its area, and usually communicating with the sea. See Atoll.

from The Century Dictionary and Cyclopedia

  • n. An area of shallow water, or even of marshy land, bordering on the sea, and usually separated from the region of deeper water outside by a belt of sand or of sand-dunes, more or less changeable in position.
  • n. With reference to Tuscany and some other parts of Italy, the basin of a hot spring, especially one from which borax is obtained: from the Italian use of lagone in this sense.
  • n. In occasional use, the area of still water inclosed within an atoll, which is often called a lagoon island. See atoll.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a body of water cut off from a larger body by a reef of sand or coral

Etymologies

French lagune and Italian laguna, both from Latin lacūna, pool, hollow, gap, from lacus, lake.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Adapted from Latin lacuna. Related to Old English lagu via Proto-Indo-European. (Wiktionary)

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