bone marrow

noun

: 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

Examples of bone marrow in a Sentence

Recent Examples on the Web

News Peg Farber’s decision to allow the cases to be consolidated came one day after news broke that Weinstein had been diagnosed with bone marrow cancer. —Molly Bohannon, Forbes, 23 Oct. 2024

State Judge Curtis Farber's decision came two days after NBC News reported that Weinstein had been diagnosed with an uncommon form of bone marrow cancer, chronic myeloid leukemia, according to two sources. —Daniel Arkin, NBC News, 23 Oct. 2024

Weinstein appeared in court Wednesday morning for the first time since being diagnosed with chronic myeloid leukemia, a form of bone marrow cancer, earlier in the week. —Jordan Moreau, Variety, 23 Oct. 2024

Harvey Weinstein has been diagnosed with bone marrow cancer, according to reports. —Escher Walcott, People.com, 22 Oct. 2024

Word History

First Known Use

1590, in the meaning defined above

Kids Definition

bone marrow

noun

: a soft tissue rich in blood vessels that fills the cavities of most bones and occurs in two forms:

a

: one that is yellowish and fatty and is found especially in long bones (as the femur)

b

: one that is reddish, is the main place where blood cells are formed, and in adults is limited especially to certain flat or short bones (as the ribs)

Medical Definition

bone marrow

noun

: 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 that consists chiefly of fat cells and is found especially in the cavities of the long bones

called also yellow marrow

b

: a reddish bone marrow that contains little fat, is the chief site of red blood cell and blood granulocyte formation, and occurs in the normal adult in cancellous tissue especially of certain flat bones

called also red marrow