cra·​nio·​syn·​os·​to·​sis | \ ˌkrā-nē-ō-ˌsi-ˌnä-ˈstō-səs How to pronounce craniosynostosis (audio) \

Definition of craniosynostosis

: premature fusion of the sutures of the skull

Examples of craniosynostosis in a Sentence

Recent Examples on the Web

Diego is terminally ill, battling an advanced form of craniosynostosis, and despite six surgeries, his spine is growing into his skull. Justin Barrasso,, "The Week in Wrestling: WWE Still a Big Part of John Cena’s Future Plans," 12 June 2019 Payton, who does not attend the elementary school, was born with craniosynostosis, a birth defect in which a baby’s skull bones connect too early, according to the Centers for Disease Control and Prevention. Char Adams,, "Students Give Boy, 5, with Brain Condition a Doll with Matching Surgery Scars: He Looks 'Like Me'," 4 June 2019 Paul Davis' daughter was born with sagittal craniosynostosis. Bryan Lowry, kansascity, "Paul Davis says Congress should disclose names of members who settle harassment cases," 13 Dec. 2017 My grandson recently had surgery to correct craniosynostosis. Sainted & Tainted Writers, Twin Cities, "Sainted & Tainted: And along came Phil …," 25 Feb. 2017

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

See More

First Known Use of craniosynostosis

1951, in the meaning defined above

History and Etymology for craniosynostosis

New Latin

Keep scrolling for more

Learn More about craniosynostosis

Statistics for craniosynostosis

Look-up Popularity

Time Traveler for craniosynostosis

The first known use of craniosynostosis was in 1951

See more words from the same year

Keep scrolling for more

More Definitions for craniosynostosis


cra·​nio·​syn·​os·​to·​sis | \ -ˌsin-ˌäs-ˈtō-səs How to pronounce craniosynostosis (audio) \
plural craniosynostoses\ -​ˌsēz How to pronounce craniosynostoses (audio) \

Medical Definition of craniosynostosis

: the premature closure during infancy of the fibrous joints of the skull (such as the coronal suture or sagittal suture) Left untreated, craniosynostosis can lead to increased intracranial pressure, resulting in headaches, visual disturbances and developmental delay.The Chicago Daily Herald, 23 Nov. 2009

More from Merriam-Webster on craniosynostosis Encyclopedia article about craniosynostosis

Comments on craniosynostosis

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


one from the Upper Peninsula of Michigan

Get Word of the Day daily email!

Test Your Vocabulary

Musical Words Quiz

  • gramophone
  • Which word describes a musical performance marked by the absence of instrumental accompaniment?
Spell It

Can you spell these 10 commonly misspelled words?

Word Winder's CrossWinder

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!