Standard Lemma guide
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noun
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.
Definition source: English Wiktionary via Wiktextract
Usage: countable, uncountable
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
History
From lumbar + -ization.
