marrow

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. Bone marrow.
2. n. The spinal cord.
3. n. The inmost, choicest, or essential part; the pith.
4. n. Strength or vigor; vitality.

Century Dictionary and Cyclopedia

1. n. A soft tissue found in the interior of bones, both in the cylindrical hollow of the long bones and in the hollows of cancellated bony structures; the medulla or medullary matter of bone. It varies greatly in different situations. Ordinary marrow of the shafts of adult bones, as the humerus and femur, is a soft yellow solid, consisting of about 95 per cent. of fat. The red marrow of various bones, vertebral, cranial, sternal, and costal, is softer, and contains very few fat-cells, but numerous marrow-cells and cells resembling the nucleated red corpuscles of the embryo. The so-called spinal marrow, or medulla spinalis, is the spinal cord, the central axis of the nervous system, a tissue of an entirely different character, not found in the hollow of a bone, but in the cavity running through the chain of vertebræ.
2. n. The pith of plants.
3. n. The pulp of fruits.
4. n. Figuratively, the inner substance; the essence; the essential strength; the inner meaning, purpose, etc.; the pith.
5. n. The alligator-pear. See avocado.
6. To fill with marrow or with fat.
7. n. A companion or mate; an associate; an intimate friend; a fellow; hence, one of a pair of either persons or things; a match: as, your knife's the very marrow o' mine.
8. To associate with; hence, to match; fit.
9. Soft; tender.

Wiktionary

1. n. Geordie, informal A friend, pal, buddy, mate.
2. n. uncountable The substance inside bones which produces blood cells.
3. n. countable A kind of vegetable like a large courgette/zucchini or squash.

GNU Webster's 1913

1. n. (Anat.) The tissue which fills the cavities of most bones; the medulla. In the larger cavities it is commonly very fatty, but in the smaller cavities it is much less fatty, and red or reddish in color.
2. n. The essence; the best part.
3. n. Scot. One of a pair; a match; a companion; an intimate associate.
4. v. To fill with, or as with, marrow or fat; to glut.

WordNet 3.0

1. n. any of various squash plants grown for their elongated fruit with smooth dark green skin and whitish flesh
2. n. large elongated squash with creamy to deep green skins
3. n. very tender and very nutritious tissue from marrowbones
4. n. the fatty network of connective tissue that fills the cavities of bones
5. n. the choicest or most essential or most vital part of some idea or experience