IPA: /ˌhaɪpərˈpaɪrɛksiə/
KK: /haɪpərˈpaɪrɛksiə/
An extremely high body temperature, usually above 106 degrees Fahrenheit, often due to illness.
The patient was diagnosed with hyperpyrexia after showing a temperature of 107 degrees.
Hyperpyrexia → It is formed from "hyper-" (meaning excessive or above normal) and "pyrexia" (from Greek "pyrexia", meaning fever). The word describes a condition of having an excessively high fever.
Think of 'hyper-' meaning excessive and 'pyrexia' relating to fever — this helps you remember that hyperpyrexia refers to an extremely high fever.
No commonly confused words.