<p><strong>noun</strong></p><ul><li>a soft, fatty, vascular tissue in the interior cavities of bones that is a major site of blood cell production.</li><li>the inmost or essential part: to pierce to the marrow of a problem.</li><li>strength or vitality: Fear took the marrow out of him.</li><li>rich and nutritious food.</li><li>vegetable marrow.</li></ul>