synostosis
noun
syn·os·to·sis
ˌsi-ˌnä-ˈstō-səs 
plural synostoses
ˌsi-ˌnä-ˈstō-ˌsēz
: union of two or more separate bones to form a single bone
Examples of synostosis in a Sentence
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Aist was born with congenital radioulnar synostosis, a condition leading to the abnormal connection of the bones in the forearm, the radius and ulna, according to the National Institutes of Health.
—
Greeley Tribune, The Denver Post, 19 July 2020
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Greeley Tribune, The Denver Post, 19 July 2020
Cite this Entry
“Synostosis.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/synostosis. Accessed 30 Oct. 2025.
Copy CitationMedical Definition
synostosis
noun
syn·os·to·sis
ˌsin-ˌäs-ˈtō-səs
plural synostoses
-ˌsēz
: union of two or more separate bones to form a single bone
also
: the union so formed (as at an epiphyseal line)
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