Dictionaryes•tu•ar•yPronunciation: (es'chOO-er"ē), [key] —n., —pl. -ar•ies. 1. that part of the mouth or lower course of a river in which the river's current meets the sea's tide. 2. an arm or inlet of the sea at the lower end of a river. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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