medulla /me-dulˈə/

1. The inner portion of an organ, hair, or tissue
2. Bone marrow
3. Pith
4. A loose or spongy mass of hyphae

medullar or medullˈary adjective

Consisting of, or resembling, marrow or pith

medullˈate adjective

Having medulla

medˈullated adjective

Provided with a medullary sheath

medulla oblongāˈta (or /-äˈtə/) noun

That part of the brain that tapers off into the spinal cord

medullary ray noun (botany)

A band of cells (appearing as a ray in cross-section) cutting radially through wood and bast

medullary sheath noun

1. A thin layer surrounding the pith (botany)
2. A whitish fatty membrane which surrounds the axons of the central nervous system in vertebrates and acts as an insulating coat (anatomy)

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