medulla

Meanings

Plural: medullae, medullas, medullæ

Noun

• a white fatty substance that forms a medullary sheath around the axis cylinder of some nerve fibers
• 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"
• the inner part of an organ or structure in plant or animal
• The soft inner part of something, especially the pith of a fruit.
• The inner substance of various organs and structures, especially the marrow of bones.
• The medulla oblongata.
• The internal tissue of a plant.

Synonyms

bulb, medulla oblongata, myelin, myeline

Antonyms

cortex