exanthema

Concise Oxford English Dictionary © 2008 Oxford University Press:
exanthema /ɪkˈsanθɪmə, ˌɛksanˈθiːmə/

▶noun (pl. exanthemata) Medicine a skin rash accompanying a disease or fever.

– derivatives
exanthematic adjective,
exanthematous adjective.

– origin C17: via late L. from Gk exanthēma ‘eruption’, from ex- ‘out’ + antheein ‘to blossom’.