n. | 1. | A place where water boils up; a spring that wells forth. |
2. | A passage, as the mouth of a river or lake, where the tide meets the current; an arm of the sea; a frith. | |
a. | 1. | Belonging to, or formed in, an estuary; |
Noun | 1. | estuary - the wide part of a river where it nears the sea; fresh and salt water mix |