py·ro·gen /ˈpaɪrəʤən/
  致熱物; 致熱原; 熱原; 熱原質
  py·ro·gen /ˈpaɪrəʤən/ 名詞
  熱原,熱精,致熱原,發熱(性)物質
  Pyr·o·gen n.
  1. Electricity. [R.]
  2. Physiol. Chem. A poison separable from decomposed meat infusions, and supposed to be formed from albuminous matter through the agency of bacteria.
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  pyrogen
       n : any substance that can cause a rise in body temperature
           [syn: pyrectic]