ESTUARY

estuary. Estuary, n. an arm or mouth of the sea, a frith

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Es″tu‐a‐ry (?), n.; pl. Estuaries (#). [[L. aestuarium, from aestuare to surge. See Estuate.]] [Written also æstuary.] 1. 1. A place where water boils up; a spring that wells forth. Boyle.
2. 2. A passage, as the mouth of a river or lake, where the tide meets the current; an arm of the sea; a frith.
it to the sea was often by long and wide estuaries. Dana.