MEDULLA
medulla
(noun) the inner part of an organ or structure in plant or animal
myelin, myeline, medulla
(noun) a white fatty substance that forms a medullary sheath around the axis cylinder of some nerve fibers
Source: WordNet® 3.1
Etymology
Noun
medulla (plural medullas or medullae or medullæ)
The soft inner part of something, especially the pith of a fruit.
(anatomy) The inner substance of various organs and structures, especially the marrow of bones.
(anatomy) The medulla oblongata.
(botany) The internal tissue of a plant.
Source: Wiktionary
Me*dul"la, n. Etym: [L.]
1. Marrow; pith; hence, essence. [Obs.] Milton.
2. (Anat.)
Definition: The marrow of bones; the deep or inner portion of an organ or
part; as, the medulla, or medullary substance, of the kidney;
specifically, the medula oblongata.
3. (Bot.)
Definition: A soft tissue, occupying the center of the stem or branch of a
plant; pith. Medulla oblongata. Etym: [L., oblong medulla] (Anat.),
the posterior part of the brain connected with the spinal cord. It
includes all the hindbrain except the cerebellum and pons, and from
it a large part of the cranial nerves arise. It controls very largely
respiration, circulation, swallowing, and other functions, and is the
most vital part of the brain; -- called also bulb of the spinal cord.
See Brain.
Source: Webster’s Unabridged Dictionary 1913 Edition