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English definition of “myelin”

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myelin

noun [U] uk   /ˈmaɪə.lɪn/ specialized us  
a substance containing a lot of fat that forms a covering around nerves, especially those in the brain, protecting them and helping them to send signals effectively: The myelin sheath around the neuron is damaged.
(Definition of myelin from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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