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bone marrow

American

noun

marrow.

bone marrow British

noun

See marrow 1

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

bone marrow Scientific

The spongy, red tissue that fills the bone cavities of mammals. Bone marrow is the source of red blood cells, platelets, and most white blood cells.

bone marrow Cultural

See marrow.

Example Sentences

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bone marrow

His patient, a young Albanian man, died after a bone marrow transplant in East London.

From Slate ● Oct. 16, 2026

When administered to mice, the progenitor cells established themselves in the bone marrow and other locations responsible for blood cell production.

From Science Daily ● Oct. 16, 2026

Amelia is currently in remission, undergoing regular bone marrow and blood tests every three months, and has returned to school.

From BBC ● Oct. 11, 2026

Multiple myeloma is a cancer of a type of white blood cells called plasma cells in the bone marrow.

From Los Angeles Times ● Sep. 30, 2026

I could touch the stones the old woman wore—its bone marrow.

From "The Woman Warrior" by Maxine Hong Kingston

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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023