marrow; pith; quintessence; essence

spinal cord; medulla spinalis

(bound form) bone marrow; (fig.) innermost part; (botany) pith

(anatomy) medulla oblongata

tooth pulp

(mineralogy) chalcedony; exquisite wine

essence

lit. spirit and marrow; the essential character

brain tissue; gray matter; brain; medulla

pith knot (in timber)

brains; gray matter

myelin sheath (membrane surrounding axon of nerve cell)

(mineralogy) carnelian

red bone marrow; hematopoietic marrow

(mineralogy) chrysoprase

myelitis; inflammation of spinal cord

(anatomy) medullary cavity; marrow cavity of a bone

yellow bone marrow

(idiom) to strike at one's core; to deeply hurt sb

lit. penetrate to the marrow (idiom); deeply affected; moved to the core

(medicine) bone marrow transplant

adrenal medulla

poliomyelitis

(medicine) multiple myeloma

myeloperoxidase (aka MPO) (molecular biology)

myelodysplastic syndrome (MDS)