Dictionary

bone marrow

noun

: a soft substance that fills the bones of people and animals

Full Definition of BONE MARROW

:  a soft highly vascular modified connective tissue that occupies the cavities of most bones and occurs in two forms:
a :  one that is yellowish, consists chiefly of fat cells, and is found especially in the cavities of long bones
b :  one that is reddish, is the chief site of blood cell formation, and occurs in the normal adult in cancellous tissue especially of certain flat bones —called also red marrow

First Known Use of BONE MARROW

1893

bone marrow

noun    (Medical Dictionary)

Medical Definition of BONE MARROW

:  a soft highly vascular modified connective tissue that occupies the cavities and cancellous part of most bones and occurs in two forms: a :  a whitish or yellowish bone marrow consisting chiefly of fat cells and predominating in the cavities of the long bones—called also yellow marrow b :  a reddish bone marrow containing little fat, being the chief seat of red blood cell and blood granulocyte formation, and occurring in the normal adult only in cancellous tissue especially in certain flat bones—called also red marrow

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