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bone marrow

American  

noun

  1. marrow.

bone marrow British  

noun

  1. 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  

  1. 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  

  1. 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.

Classifying a patient as cured also allows them to avoid intrusive, and sometimes painful, screening tests, like bone marrow biopsies.

From Slate • Mar. 29, 2026

The health board said the proposal was "necessary" after ongoing defects disrupted the running of the adult bone marrow transplant unit.

From BBC • Mar. 23, 2026

Slow-roasted bone marrow, branzino laced with herbs, the kind of flavors that made us lean in and feed each other.

From Los Angeles Times • Mar. 20, 2026

The treatment, known as anito-cel, is designed for patients with multiple myeloma, a blood cancer arising from plasma cells in the bone marrow.

From Barron's • Feb. 23, 2026

“I want a bone marrow analysis made of you,” Rick said to her.

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

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.