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Pronunciation: e-rup'shun


  1. A breaking out, especially the appearance of lesions on the skin.
  2. A rapidly developing dermatosis of the skin or mucous membranes, especially when appearing as a local manifestation of one of the exanthemata; an eruption is characterized, according to the nature of the lesion, as macular, papular, vesicular, pustular, bullous, nodular, erythematous, etc.
  3. Passage of a tooth through the alveolar process and perforation of the gums.

[L. e-rumpo, pp. -ruptus, to break out]

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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review date: Sep 19, 2016.