- 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.
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
- the widening channel of a river where it nears the sea, with a mixing of fresh water and salt (tidal) water
- an inlet of the sea
Word Origin and History for estuarial
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.
- The wide lower course of a river where it flows into the sea. Estuaries experience tidal flows and their water is a changing mixture of fresh and salt.
- An arm of the sea that extends inland to meet the mouth of a river.
A wide body of water formed where a large river meets the sea. It contains both fresh and salt water.