lumbarization
noun
lum·bar·i·za·tion
ˌləm-bə-rə-ˈzā-shən 
: a condition in which the first segment of the sacrum fails to fuse with the second segment so that it appears to be part of the lumbar vertebrae
Cite this Entry
“Lumbarization.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/lumbarization. Accessed 27 Feb. 2025.
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