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.