fe·​nes·​tra | \ fə-ˈne-strə \
plural fenestrae\ fə-​ˈne-​ˌstrē , -​ˌtrī \

Definition of fenestra

1 : a small anatomical opening (as in a bone): such as
a or fenestra ovalis \ -​ō-​ˈvā-​ləs \ or fenestra vestibuli \ -​ve-​ˈsti-​byə-​ˌlī \ : oval window
b or fenestra cochleae \ -​ˈkä-​klē-​ˌē , -​ˈkō-​klē-​ˌī \ or fenestra rotunda \ -​rō-​ˈtən-​də \ : round window
2 : an opening cut in bone

Keep scrolling for more

Other Words from fenestra

fenestral \ fə-​ˈne-​strəl \ adjective

Examples of fenestra in a Sentence

Recent Examples on the Web

All these animals are united by subtle skull features, such as the absence of a hole in the lower jaw called the mandibular fenestra and the flat, wrinkle-cusped teeth set along the jaws. Brian Switek, WIRED, "The Jurassic’s Housecat Croc," 6 June 2012

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'fenestra.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of fenestra

circa 1737, in the meaning defined at sense 1

History and Etymology for fenestra

New Latin, from Latin, window

Keep scrolling for more

Learn More about fenestra

Statistics for fenestra

Look-up Popularity

Time Traveler for fenestra

The first known use of fenestra was circa 1737

See more words from the same year

Keep scrolling for more

More Definitions for fenestra


fe·​nes·​tra | \ fə-ˈnes-trə \
plural fenestrae\ -​ˌtrē , -​ˌtrī \

Medical Definition of fenestra

1 : a small anatomical opening (as in a bone): as
2a : a small opening cut in bone : window sense 2
b : a small opening in a surgical instrument (as an endoscope)

Other Words from fenestra

fenestral \ -​trəl \ adjective

More from Merriam-Webster on fenestra

Rhyming Dictionary: Words that rhyme with fenestra

Comments on fenestra

What made you want to look up fenestra? Please tell us where you read or heard it (including the quote, if possible).


to gather or build up little by little

Get Word of the Day daily email!

Test Your Vocabulary

Homophone Quiz

  • three-bears-two-of-them-look-like-theyre-whispering-to-a-third-bear-who-looks-chuffed-to-be-the-center-of-attention
  • In order to judge how people felt, the senator's office hired a firm to take a ______.
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

Syn City

Test Your Knowledge - and learn some interesting things along the way.


Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!