One of the mysteries of the English language finally explained.
The gelatinous central portion of an intervertebral disc, composed of hydrated proteoglycans.
Late 19th century; earliest use found in Michael Foster (1836–1907), physiologist and politician. From scientific Latin nucleus pulposus from classical Latin nucleus + pulpōsus.
nucleus pulposus/ˌnjuːklɪəs pʌlˈpəʊsəs/
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