cra·​nio·​syn·​os·​to·​sis ˌkrā-nē-ō-ˌsi-ˌnä-ˈstō-səs How to pronounce craniosynostosis (audio)
: premature fusion of the sutures of the skull

Examples of craniosynostosis in a Sentence

Recent Examples on the Web What are the symptoms of craniosynostosis? Maggie O'Neill,, 6 July 2020 He was diagnosed with craniosynostosis as a child but successfully outgrew a condition where his skull bones began to prematurely fuse in two places. Shannon Russell, The Courier-Journal, 10 Apr. 2021 Dove was diagnosed with lambdoid craniosynostosis following a CT scan and was recommended for neurosurgery. Claudia Harmata,, 2 Aug. 2020

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'craniosynostosis.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History


New Latin

First Known Use

1951, in the meaning defined above

Time Traveler
The first known use of craniosynostosis was in 1951

Dictionary Entries Near craniosynostosis

Cite this Entry

“Craniosynostosis.” Dictionary, Merriam-Webster, Accessed 24 Jun. 2024.

Medical Definition


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

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