bone marrow

noun
marrow1 ( def 1 ).
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Collins
World English Dictionary
bone marrow
 
n
See marrow

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

bone marrow n.
The soft, fatty, vascular tissue filling the cavities of bones, having a stroma of reticular fibers and cells.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
bone marrow  
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

bone marrow definition


See marrow.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Some types can be derived from umbilical cord blood, adult bone marrow, or
  possibly even adult skin.
There are many types of stem cells, from bone marrow to fetal tissue to embryos.
The bone marrow was the source of the stem cells that made the procedure
  newsworthy.
Bone marrow plays an important role in the immune system, and also in bodily
  rejuvenation.
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