Webster's English Dictionary

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eruption

erup.tion \i-'r*p-sh*n\ \-'r*p-tiv\ n 1a: an act, process, or instance of 
   erupting  1b: the breaking out of rash on the skin or mucous membrane  2a: 
   a product of erupting  2b: an erupted rash or one of its lesions  - 
   erup.tive aj