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