fenestra noun. [fɪ'nɛstrǝ] Pl. -trae [-tri:]. E19.
[Latin = window.]
1. Botany. A small mark or scar left by the separation of the seed from the ovary. rare. E19.
2. Anatomy. A small hole or opening in a bone; esp. either of two openings, covered by membranes, in the inner ear (see below). M19.
fenestra ovalis [ǝʊ'vɑ:lɪs, -'veɪl-] [Latin = oval window] the opening between the middle ear and the vestibule. fenestra rotunda [rǝ'tʌndǝ] [Latin = round window] the opening between the cochlea and the middle ear.

3. Medicine.
a. A perforation in a surgical instrument other than in the handle. Also, an opening in a dressing. L19.
b. A hole cut surgically in any structure of the body; esp. one made by fenestration. M20.

[TahlilGaran] English Dictionary ▲