(1) The presence of openings or fenestrae in a part. (2) Making openings in a dressing to allow inspection of the parts. (3) In dentistry, a surgical perforation of the mucoperiosteum and alveolar process to expose the root tip of a tooth to permit drainage of tissue exudate. (4) An operation to create an opening in the horizontal semicircular canal to improve hearing in otosclerosis.
