πυρέσσωpyréssō, poo-res'-so; from G4443; to be on fire, i.e. (specially), to have a fever:—be sick
of a fever.
Thayer's Greek Lexicon
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STRONGS G4445:
πυρέσσω; (πῦρ); (Vulg., Celsus, Senec., othersfebricito); to be sick with a fever: Matthew 8:14; Mark 1:30. (Euripides, Aristophanes, Plutarch, Lucian, Galen, others.)