tympanotomy 1. The removal of fluid (often infected) from the middle ear space by creating a incision in the eardrum. 2. A surgically placed tiny incision in the eardrum so any fluid behind the eardrum can then drain and usually thickened secretions can be removed. A small plastic ear tube (a tympanostomy tube) is often inserted into the eardrum t... Found on http://www.wordinfo.info/words/index/info/view_unit/2203/3