pyrexia
Concise Oxford English Dictionary © 2008 Oxford University Press:
pyrexia /pʌɪˈrɛksɪə, pɪ-/
▶noun Medicine fever.
– derivatives
pyrexial adjective,
pyrexic adjective.
pyrexial adjective,
pyrexic adjective.
– origin C18: mod. L., from Gk purexis, from puressein ‘be feverish’.
'pyrexia' also found in these Oxford entries:

