/ Dictionary / Index E estuary: Meaning and Definition of Find definitions for: es•tu•ar•y Pronunciation: (es'ch-er"ē), [key] — pl. -ar•ies. that part of the mouth or lower course of a river in which the river's current meets the sea's tide. 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. See also: estuary (Thesaurus) estuarine esu Related Content Daily Word Quiz: cetacean Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language