Producing or tending to produce fever; fever-causing.
From Latin 'febris' (fever) plus 'facere' (to make), creating a word meaning 'fever-making,' following the same pattern as maleficent (harm-making) and beneficent (good-making).
Febrifacient is technically correct but so rare that most modern doctors wouldn't use it—yet it's built from the same morphemes as common words like 'beneficent,' showing how specialized vocabulary can split off from general language.
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