erup·tion noun \i-ˈrəp-shən\
: an act, process, or instance of erupting <the eruption of the tooth from the gum>; specifically : the breaking out of an exanthem or enanthem on the skin or mucous membrane (as in measles)
: something produced by an act or process of erupting: as a : the condition of the skin or mucous membrane caused by erupting b : one of the lesions (as a pustule) constituting this condition
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