髓 (w)

(suǐ) marrow; essence; quintessence; pith (soft interior of plant stem)

髓结 (w)

(suǐjié) pith knot (in timber)

髓脑 (w)

(suǐnǎo) brains; gray matter

髓过氧化物酶 (w)

(suǐguòyǎnghuàwùméi) Myeloperoxidase (MPO), chemical in neutrophil granulocytes, used to kill pathogens

髓鞘 (w)

(suǐqiào) myelin sheath (membrane surrounding axon of nerve cell)