IPA: //paɪˈrɛksɪk//
KK: /ˈpaɪrɛksɪk/
Relating to or characterized by fever; having a high body temperature.
The patient was pyrexic, showing signs of a severe infection.
Pyrexic → It is derived from the Greek root "pyrexia" (meaning fever) combined with the suffix "-ic" (meaning pertaining to). The word "pyrexic" refers to something that is related to or characterized by fever.
Think of 'pyrexia' which means fever, and remember that 'pyrexic' describes something related to fever.