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Definition of estuary:

  1. A passage, as the mouth of a river or lake, where the tide meets the current; an arm of the sea; a frith.
  2. A place where water boils up; a spring that wells forth.
  3. Belonging to, or formed in, an estuary; as, estuary strata.

Synonyms:

arm, branch, cataract, embayment, bed, water, confluence, firth, creek, cascade, tidewater, fjord, arm of the sea, bight, loch, drowned river, channel, tidal river, bottom, backwater.

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