A substance or treatment that kills fever or suppresses febrile conditions.
From Latin 'febris' (fever) plus '-cide' (meaning 'to kill,' from Latin 'caedere'), following the pattern of words like pesticide and herbicide that describe killing or destruction.
Febricide is a perfectly logical word formation—fever + killer—but it's so rare that modern doctors just say 'antipyretic' instead, showing how technical vocabulary can become extinct even when the word-making rules are sound.
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