myelin

Noun
  1. A white fatty substance that forms a medullary sheath around the axis cylinder of some nerve fibers (synset 114982032)
    is a type of: fat - a soft greasy substance occurring in organic tissue and consisting of a mixture of lipids (mostly triglycerides)
    substance meronym: medullary sheath, myelin sheath - a layer of myelin encasing (and insulating) the axons of medullated nerve fibers
    same as: medulla, myeline

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