| 1. | Anatomy. a soft, fatty, vascular tissue in the interior cavities of bones that is a major site of blood cell production. |
| 2. | the inmost or essential part: to pierce to the marrow of a problem. |
| 3. | strength or vitality: Fear took the marrow out of him. |
| 4. | rich and nutritious food. |
| 5. | Chiefly British. vegetable marrow. |

The soft, specialized connective tissue that fills the cavities of bones. One kind of bone marrow is responsible for manufacturing red blood cells in the body.
marrow mar·row (mār'ō)
n.
Bone marrow.
The spinal cord.