Medúlla
WordNet

noun


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