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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

Experts later determined she suffered from severe anemia; blood clots in both wings and one kidney; liver and lung abnormalities; and inadequate bone marrow response.

From Los Angeles Times ● Aug. 14, 2026

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

In these cases, doctors may diagnose cancer largely by examining the appearance of cells in the bone marrow.

From Science Daily ● Aug. 1, 2026

“You stay with Luba; I’ll get a patrol car here to take her to the Hall of Justice. For her bone marrow test.”

From "Do Androids Dream of Electric Sheep?" by Philip K. Dick

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