/ Dictionary / Index L lagoon: Meaning and Definition of Find definitions for: la•goon Pronunciation: (lu-gn'), [key] — n. an area of shallow water separated from the sea by low sandy dunes. Cf. laguna. any small, pondlike body of water, esp. one connected with a larger body of water. an artificial pool for storage and treatment of polluted or excessively hot sewage, industrial waste, etc. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: lagoon (Thesaurus) lagomorph Lagoon Islands Related Content Daily Word Quiz: arboreal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language