Es"tu*a*ry (?), n.; pl. Estuaries (#). [L. aestuarium, from aestuare to surge. See Estuate.] [Written also aestuary.]
1.
A place where water boils up; a spring that wells forth.
[Obs.]
Boyle.
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.
© Webster 1913.
Es"tu*a*ry, a.
Belonging to, or formed in, an estuary; as, estuary strata.
Lyell.
© Webster 1913.