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

myelin

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