Definition of Exanthem Exanthem: A rash. The word "exanthem" comes from the Greek "exanthema" which means "a breaking out." "Anthos" in Greek is "a flower," particularly a flower blossom, so a child breaking out with an rash is likened to a flower bursting into bloom.
Exanthem: A rash. The word "exanthem" comes from the Greek "exanthema" which means "a breaking out." "Anthos" in Greek is "a flower," particularly a flower blossom, so a child breaking out with an rash is likened to a flower bursting into bloom.