What does "lumbarization" mean?

A spinal anomaly in which the first and second segments of the sacrum do not fuse, and consequently the lumbar spine appears to have six vertebrae or segments, not five, while the sacrum appears to have only four.

Lumbarization

noun

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Definitions

Noun

1
A spinal anomaly in which the first and second segments of the sacrum do not fuse, and consequently the lumbar spine appears to have six vertebrae or segments, not five, while the sacrum appears to have only four. countable, uncountable

Etymology

From lumbar + -ization.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.