The quality or state of boiling, surging, or being in agitation; heat and turbulence (archaic).
From 'estuous' plus '-ity' (noun suffix), ultimately from Latin 'aestuosus' (ardent, seething, hot).
This archaic noun captures something modern English lost—a single word for that bubbling, restless energy of boiling water or a heated tide, reminding us that older languages often had richer words for natural phenomena.
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