n. Any diffuse or multiple affection of the skin marked by inflammation or simple hyperemia, or by effusion of lymph, or excessive exfoliation of epidermis, but usually restricted to skin-affections belonging to zymotic fevers. Also exanthem.n. A zymotic fever of which a skin-affection is normally one of the symptoms, as scarlatina or measles.n. In botany, same as die-back.