English

Definition of myelin noun from the Oxford Advanced Learner's Dictionary

 

myelin

 noun
noun
BrE BrE//ˈmaɪəlɪn//
 
; NAmE NAmE//ˈmaɪəlɪn//
 
[uncountable] (biology)
 
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a mixture of proteins and fats that surrounds many nerve cells, increasing the speed at which they send signals Word Origin late 19th cent.: from Greek muelos ‘marrow’ + -in.
See the Oxford Advanced American Dictionary entry: myelin