from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The soft, fatty, vascular tissue that fills most bone cavities and is the source of red blood cells and many white blood cells.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun anatomy The fatty vascular tissue that fills the cavities of bones; the place where new blood cells are produced.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun very tender and very nutritious tissue from marrowbones
  • noun the fatty network of connective tissue that fills the cavities of bones


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