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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

Leukemia is a cancer of the blood that begins in the bone marrow, which varies based on the type of blood cell affected and the stage of the disease.

From Los Angeles Times ● Jul. 23, 2026

According to Myeloma UK, external, smouldering myeloma is detected by the presence of abnormal cells in the bone marrow, and abnormal protein in blood and/or urine.

From BBC ● Jul. 17, 2026

Without enough vitamin B12, the bone marrow cannot produce healthy red blood cells.

From Science Daily ● Jun. 25, 2026

As the name suggests, steak is the main event, with options ranging from dry-aged ribeyes and picanha to A5 Wagyu New York strip, plus add-ons like roasted bone marrow and curry béarnaise.

From Salon ● Jun. 11, 2026

A post-mortem examination revealed a complete wasting away of the bone marrow.

From "Silent Spring" by Rachel Carson

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