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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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See Examples For:

bone marrow

Despite a battery of tests, including a contrast CT scan and bone marrow biopsy, experts could not determine what was making Jackie critically ill.

From Los Angeles Times ● Aug. 10, 2026

His condition later progressed to myelofibrosis, which causes scar tissue to develop in the bone marrow.

From Science Daily ● Aug. 1, 2026

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

"A mineral which, taken in excess, can lead to bone marrow and kidney problems," she reads.

From BBC ● Jul. 13, 2026

It was a voice, a voice to chill the bone marrow, a voice of breath-taking, ice-cold venom.

From "Harry Potter And The Chamber Of Secrets" by J. K. Rowling

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