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pyrogen (n.)

1858, as a proposed word for "electricity considered as a material substance possessing weight," from pyro- + -gen. Meaning "fever-producer, substance which, introduced into the blood, induces fever" is from 1896. Related: Pyrogenic. Greek pyrogenes meant "born in fire, wrought by fire" (compare pyrogenesis).

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Definitions of pyrogen from WordNet

pyrogen (n.)
any substance characterized by its great flammability;
pyrogen (n.)
any substance that can cause a rise in body temperature;
Synonyms: pyrectic
From wordnet.princeton.edu