Pertaining to an estuary; estuary.
'â€¦ a semi-enclosed or periodically closed coastal body of water in which the aquatic environment is affected by the physical and chemical characteristics of both fluvial [freshwater] and marine systems' ( Edgar et al. 1999).
Concerning an estuary, the part of an inlet or waterway that meets the sea and is subject to tidal movements. The water is usually brackish - a mixture of salt and fresh water.