1. [ noun ] (anatomy,zoology,neuroscience) lower or hindmost part of the brain; continuous with spinal cord; (`bulb' is an old term for medulla oblongata)
Synonyms: bulb medulla_oblongata

"the medulla oblongata is the most vital part of the brain because it contains centers controlling breathing and heart functioning"

Related terms: neural_structure hindbrain brainstem respiratory_center
2. [ noun ] (chemistry,food) a white fatty substance that forms a medullary sheath around the axis cylinder of some nerve fibers
Synonyms: myeline myelin
Related terms: fat medullary_sheath
3. [ noun ] (botany,zoology) the inner part of an organ or structure in plant or animal
Related terms: cortex plant_tissue animal_tissue adrenal_medulla
Similar spelling:   meddle