IPA: //paɪˈrɛk.si.əl//
KK: /ˈpaɪrɛksɪəl/
Relating to or characterized by fever; having a high body temperature due to illness.
The patient was pyrexial, showing signs of a serious infection.
Pyrexial → It is formed from "pyrexia" (from Greek "pur" meaning fire) and the suffix "-al" (meaning pertaining to). The word "pyrexial" refers to something pertaining to fever or elevated body temperature, which is associated with the body's response to infection or illness.
Think of 'fire' ('pur') to remember that 'pyrexial' relates to a fever, which often feels like a burning sensation.