RhymeZone: medulla definitions

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Definitions of medulla:

noun: the inner part of an organ or structure in plant or animal
noun: lower or hindmost part of the brain; continuous with spinal cord; (`bulb' is an old term for medulla oblongata)
Example: "The medulla oblongata is the most vital part of the brain because it contains centers controlling breathing and heart functioning"
noun: a white fatty substance that forms a medullary sheath around the axis cylinder of some nerve fibers