Comparative form of 'briny,' meaning more salty or containing more salt than something else.
Regular English comparative formation from 'briny' (salty) plus '-er' suffix, following the same pattern as 'salty/saltier' or 'minty/mintier'.
The Dead Sea is brinier than the ocean because it has no outlet—minerals concentrate there over millennia, making it so salty that people float effortlessly.
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