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The Collaborative International Dictionary
Exanthematous

Exanthematic \Ex*an`the*mat"ic\, Exanthematous \Ex`an*them"a*tous\, a. Of, relating to, or characterized by, exanthema; efflorescent; as, an exanthematous eruption. [1913 Webster] ||

Wiktionary
exanthematous

a. Of or pertaining to exanthem.