The quality or state of being brackish, meaning containing a mixture of salt and fresh water or having a slightly salty taste.
From 'brackish' (from Middle Dutch 'brac', meaning salty or unpalatable) plus the suffix '-ness' (Old English, forming abstract nouns from adjectives). The term emerged in maritime contexts to describe coastal and estuarine waters.
Brackish water is one of Earth's trickiest environments—organisms must tolerate wildly fluctuating salinity as tides change, making brackish estuaries some of the most challenging places to live biologically despite being incredibly productive ecosystems.
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