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intervene
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intervertebral
intervertebral disk
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intervertebral disk

in·ter·ver·te·bral disk (plural in·ter·ver·te·bral disks)


noun 
Definition:
 
cartilage between vertebrae: one of the flexible plates of cartilage connecting adjacent vertebrae of the backbone that impart flexibility and act as shock absorbers to protect the spinal cord from impact, e.g. when running

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