noun, noun which may take the genitive case particle 'no'
lumbar vertebra; lumbar vertebrae
Anatomical term for the bones of the lower spine. Both singular and plural are used in English, but Japanese does not distinguish number.
Fractures of the lumbar vertebrae are common in the elderly.
We examined the lumbar vertebrae in detail with an MRI.
lumbar puncture; spinal tap
Compound of 腰 (こし, 'lower back') and 椎 (つい, 'vertebra'). The reading よう for 腰 is the on'yomi used in medical compounds.