Boiling, seething, or surging; in a state of agitation or turbulent movement (archaic).
From Latin 'aestuare' (to surge, boil, be agitated). Related to 'aestus' (tide, heat, surge). The word connects to the same root as 'estuary.'
This beautiful archaic word originally described the surging tide at a river's mouth—imagine Romans watching the water boil back and forth—which is exactly what an 'estuant' estuary does.
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