medulla

noun
me·dul·la | \ mə-ˈdə-lə \
plural medullas or medullae\mə-ˈdə-(ˌ)lē, -ˌlī \

Definition of medulla 

1 plural medullae

a : bone marrow

b : medulla oblongata

2a : the inner or deep part of an animal or plant structure the adrenal medulla

b : myelin sheath

First Known Use of medulla

15th century, in the meaning defined at sense 1a

History and Etymology for medulla

Middle English, from Latin

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The first known use of medulla was in the 15th century

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More Definitions for medulla

medulla

noun
me·dul·la | \ mə-ˈdəl-ə , -ˈdu̇l- \
plural medullas or medullae\-(ˌ)ē, -ˌī \

Medical Definition of medulla 

1  plural medullae

a : bone marrow

b : medulla oblongata

2a : the inner or deep part of an organ or structure the adrenal medulla

b : myelin sheath

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