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marrow

The soft tissue inside bones; red marrow makes blood cells and yellow marrow stores fat.

MAIR-oh noun

What it means

Usually short for bone marrowbone MAIR-ohThe soft, spongy tissue inside bones that makes blood cells.Full entry . Red marrow, found in flat bones such as the hip bones, breastbone and spine in adults, makes red blood cells, white blood cells and platelets. Yellow marrow, mostly in the long bones, is fat. In the spinal cord, "marrow" was the old word for the cord itself.

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Related terms

bone marrow

The soft, spongy tissue inside bones that makes blood cells.

multiple myeloma

A cancer of plasma cells, the white blood cells that make antibodies, that grows in the bone marrow.

-poiesis

A word ending that means making or forming.

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