spheno-occipital synchondrosis
noun
sphe·no-oc·cip·i·tal synchondrosis
| \ ˌsfē-nō-äk-ˈsip-ət-ᵊl-
\
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Medical Definition of spheno-occipital synchondrosis
: the cartilaginous junction between the basisphenoid and basioccipital bones of the mammalian skull that in humans is usually closed by the age of 25