medulla

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

noun a white fatty substance that forms a medullary sheath around the axis cylinder of some nerve fibers
noun lower or hindmost part of the brain; continuous with spinal cord; (`bulb' is an old term for medulla oblongata)
noun the inner part of an organ or structure in plant or animal

Borrowed from Latin medulla (“pith, marrow”), perhaps from medius (“middle”).

Me longus silendi Edit amor, facilesque luctus Hausit medullas. — Biographia Literaria, Samuel Taylor Coleridge
The invisible power flows into the human body through the gate of the medulla oblongata. — Autobiography of a Yogi, Paramahansa Yogananda
To accomplish a true reflex movement, a whole mechanism is necessary, set up in the spinal cord or the medulla. — Creative Evolution, Bergson, Henri

myelin, myeline

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