Biological morphology
- Fenestrae are found in cancellous bones, particularly in the skull.
- The round window and oval window in anatomy are also known as the fenestra rotunda and fenestra ovalis.
- Fenestrae are found in endothelium of fenestrated capillaries, enabling rapid exchange of molecules between blood and surrounding tissue.
- The elastic layer of the tunica intima is a fenestrated membrane.
- In surgery, a fenestration is a new opening made in a part of the body to enable drainage or access.

Plant biology and mycology
- Perforations in a perforate leaf are described as fenestrae, and the leaf is called a fenestrate leaf.
- The leaf window, also known as a fenestra, is a translucent structure that transmits light.
- Examples of fenestrate structures in the fungal kingdom include the gaps in the indusium of the mushroom Phallus duplicatus and the thallus of the coral lichen Pulchrocladia retipora.
- Fenestraria is a plant genus with fenestrate structures.
- Plant biology and mycology study fenestrate structures in plants and fungi.

Zoology
- The trilobite Fenestraspis possessed extensive fenestrae in the posterior part of the body.
- The paleognathae have an ilio-ischiatic fenestra.
- Fenestrae are used to distinguish the three types of amniote: anapsids, diapsids, and synapsids.
- The presence and number of fenestrae in the skull behind the eye socket differentiate these groups.
- Anapsids have a complete skull with no gaps, diapsids have two fenestrae, and synapsids have one fenestra behind the eye socket.

Fenestron
- Fenestron refers to a shrouded tail rotor of a helicopter.

References
- Definition of fenestra in English from Oxford Dictionaries.
- Barr's the Human Nervous System: An Anatomical Viewpoint by J.A. Kiernan and M.L. Barr.
- Dorland's Illustrated Medical Dictionary, 28th edition, by W.A. Newman Dorland.
- Human Microscopic Anatomy: An Atlas for Students of Medicine and Biology by R.V. Krstić.
- The Kew Plant Glossary: An Illustrated Dictionary of Plant Terms by H. Beentje and J. Williamson.

Merriam-Webster Online Dictionary
fenestra (noun)
1.
a small anatomical opening (as in a bone) as
a) - oval window called also fenestra ova*lis -ō-ˈvā-ləs fenestra ves*tib*u*li -ves-ˈti-byə-(ˌ)lē
b) - round window called also fenestra cochleae fenestra ro*tun*da -rō-ˈtən-də
2.
an opening cut in bone
Fenestra (Wikipedia)

A fenestra (fenestration; pl.: fenestrae or fenestrations) is any small opening or pore, commonly used as a term in the biological sciences. It is the Latin word for "window", and is used in various fields to describe a pore in an anatomical structure.

Fenestra (Wiktionary)

English

Etymology

Borrowed from Latin fenestra. Existed in Middle English as fenestre, fenester, from Old English fenester (window).

Noun

fenestra (plural fenestras or fenestrae or

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