my·e·lin
noun/ˈmaɪəlɪn/
/ˈmaɪəlɪn/
[uncountable] (biology)- a mixture of proteins and fats that surrounds many nerve cells, increasing the speed at which they send signals
髓磷脂，髓鞘质（由脂质、蛋白质组成，包绕在神经细胞轴突上） Word Originlate 19th cent.: from Greek muelos ‘marrow’ + -in.