No, you are not to believe they remained, retaining all their senses, to witness this pyretic debauch of high society.
1809, from French pyrétique or directly from Modern Latin pyreticus, from Greek pyretos "fever, burning heat," related to pyr "fire" (see fire (n.)). As a noun, "a pyretic agent," from 1728.
pyretic py·ret·ic (pī-rět'ĭk)adj. Relating to, producing, or affected by fever.