The quality or state of having fever; feverishness or the degree of fever present.
From Latin 'febris' (fever) plus '-icity' (from '-icus' becoming '-icity' in English), forming an abstract noun for the quality or degree of a condition, like acidity or ferocity.
Medieval physicians spoke of febricity the way we might discuss intensity or severity—they were building a precise technical vocabulary where each fever-related word had slightly different nuances and uses.
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