lagoon

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la·goon / ləˈgoōn/ • n. a stretch of salt water separated from the sea by a low sandbank or coral reef. ∎  the enclosed water of an atoll. ∎  a small freshwater lake near a larger lake or river. ∎  an artificial pool for the treatment of effluent or to accommodate surface water that overflows drains during heavy rain.DERIVATIVES: la·goon·al / -ˈgoōnl/ adj.

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