What is 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 called?

estuary — 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's 1913.)