This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. The part of the wide lower course of a river where its current is met by the tides.

n. An arm of the sea that extends inland to meet the mouth of a river.

n. Coastal water body where ocean tides and river water merge.

n. An ocean inlet also fed by fresh river water.

n. A place where water boils up; a spring that wells forth.

n. A passage, as the mouth of a river or lake, where the tide meets the current; an arm of the sea; a frith.

adj. Belonging to, or formed in, an estuary.

n. An arm or inlet of the sea, particularly one that is covered by water only at high tide.

n. That part of the mouth or lower course of a river flowing into the sea which is subject to tides; specifically, an enlargement of a riverchannel toward its mouth in which the movement of the tides is very prominent.

n. A place where water boils up.

Belonging to or formed in an estuary: as, estuary strata.

n. the wide part of a river where it nears the sea; fresh and salt water mix

"He'll take a helicopter tour of the thin orange line of protective booms that divides thousands of acres of estuary from the toxic tides."

water    body of water   

Humber    para river    rio de la plata    La Plata    firth    plata river    para   

Estuary English   

frith    arm    firth    lough   

lagoon    inlet    bayou    harbors    waterway    creek    wetlands    bight    cove    marsh