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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.

Scientists have uncovered an unexpected way the immune system can attack cancer, a finding that challenges a long-standing principle in immunology and could lead to new approaches for cancer treatment and bone marrow transplantation.

From Science Daily • Jun. 4, 2026

My youngest brother, Chris Landro, donated his bone marrow via surgery to extract it from the bones of his lower back.

From The Wall Street Journal • Apr. 19, 2026

The researchers found no trace of the virus in samples of the man's blood, gut and bone marrow.

From Barron's • Apr. 13, 2026

It starts in the bone marrow and attacks the body on several fronts.

From Slate • Mar. 29, 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