General Definition: 1. A round protrusion or swelling on the body, such as a cyst or boil, or anything or any action directly or indirectly associated with this, especially a blister. As a Noun: 1. A painful swelling containing clear liquid on the surface of your skin, often the result of burning or rubbing. English = blister, cyst, abscess. As a Verb or Adjective: 1. To have blisters.