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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

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

bone marrow

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

From Los Angeles Times ● Oct. 4, 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

Those channels provide a direct route through which immune cells and cellular waste can travel between the brain and nearby skull bone marrow.

From Science Daily ● Sep. 17, 2026

In the new mouse study, the scientists followed proteins as they moved out of the brain, through these channels, and into the skull bone marrow.

From Science Daily ● Sep. 17, 2026

John’s medical hypothesis was based on the observation that phosphorus naturally concentrates in bone marrow.

From "Big Science" by Michael Hiltzik

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