Etymology
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estuary (n.)

1530s, from Latin aestuarium "a tidal marsh, mudbeds covered by water at high tides; channel inland from the sea," from aestus "boiling (of the sea), tide, heat," from PIE *aidh- "to burn" (see edifice).

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Definitions of estuary

estuary (n.)
the wide part of a river where it nears the sea; fresh and salt water mix;
From wordnet.princeton.edu