Noun estuary has 1 sense
  1. estuary - the wide part of a river where it nears the sea; fresh and salt water mix
    --1 is a kind of
    body of water, water
    --1 is a part of river
    --1 has particulars:
     firth; Humber; Para, Para River; Rio de la Plata, La Plata, Plata River
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