noun, plural medullas, medullae [muh-duhl-ee] .
the marrow of the bones.
the soft, marrowlike center of an organ, as the kidney or adrenal gland.
Botany. the pith of plants.

1635–45; < Latin: marrow, pith Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
medulla (mɪˈdʌlə)
n , pl -las, -lae
1.  anatomy
 a.  the innermost part of an organ or structure
 b.  short for medulla oblongata
2.  botany another name for pith
[C17: from Latin: marrow, pith, probably from medius middle]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1651, "hindmost segment of the brain," from L., lit. "marrow," also "pith of plants," of unknown origin, perhaps related to or influenced by medius "middle" (but cf. also O.Ir. smiur, Welsh mer "marrow").
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

medulla me·dul·la (mĭ-dŭl'ə)
n. pl. me·dul·las or me·dul·lae (-dŭl'ē)
The inner core of certain organs or body structures, such as the marrow of bone. Also called medullary substance.

me·dul'lar or med'ul·lar'y (měd'l-ěr'ē, mə-dŭl'ə-rē) adj.
The American Heritage® Stedman's Medical Dictionary
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American Heritage
Science Dictionary
medulla   (mĭ-dŭl'ə, mĭ-d'lə)  Pronunciation Key 
Plural medullas or medullae (mĭ-dŭl'ē)
  1. See medulla oblongata.

  2. The central portion of an anatomical structure, such as the adrenal gland or the kidney.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
But since other body tissues also produce catecholamines, life can go on even if the adrenal medulla fails.
The medulla is the location of the latter events in thymocyte development.
Adrenal medulla, catecholamines, and pheochromocytoma.
Images for Medulla
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