The state or quality of being feverish or having a fever.
Formed from 'febrile' plus the suffix '-ity' (state or quality), following the pattern of creating abstract nouns from adjectives in medical and scientific terminology.
This word is rarely used in modern English, but it appears in historical medical texts describing the severity or intensity of a patient's feverish state—it's like the noun form of 'how febrile someone is.'
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