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plural fenestras or fenestrae or (obsolete) fenestræ
(anatomy) An opening in a body, sometimes with a membrane. quotations examples
The platinum shaft connecting the ribbon to the piston base is a rounded wire and can be easily angulated after placement of the prosthesis for optimal incus to fenestra reach.
2010, Aina J. Gulya, Lloyd B. Minor, Michael E. Glasscock, Glasscock-Shambaugh Surgery of the Ear, page 536