| pyrexia | <clinical sign> A fever or a febrile condition, abnormal elevation of the body temperature. Origin: Gr. Pyressein = to be feverish (06 Oct 1997) |
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| neoplasms, unknown primary | Metastases in which the tissue of origin is unknown. (12 Dec 1998) |
| fever of unknown origin | Fever in which the aetiology cannot be ascertained. (12 Dec 1998) |