noun, plural es·tu·ar·ies.
Origin of estuary
Examples from the Web for estuarial
The bulk of estuarial silt comes down the main river from the upper Basin.The Nation's River|United States Department of the Interior
noun plural -aries
Word Origin for estuary
1530s, from Latin aestuarium "a tidal marsh or opening," from aestus "boiling (of the sea), tide, heat," from PIE *aidh- "to burn" (see edifice). Related: Estuaries; estuarine.
A wide body of water formed where a large river meets the sea. It contains both fresh and salt water.