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medulla
Definitions
[mɛˈdʌlə], (Noun)
Definitions:
- the inner region of an organ or tissue, especially when it is distinct from the outer region or cortex (as in a kidney, an adrenal gland, or hair)
(e.g: the adrenal medulla produces adrenaline)
Phrases:
Origin
:
late Middle English (in the sense ‘bone marrow’): from Latin, ‘pith or marrow’
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definition by Oxford Dictionaries