marrow

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

• noun Bone marrow.
• noun The spinal cord.
• noun The marrow squash.
• noun The inmost, choicest, or essential part; the pith.
• noun Strength or vigor; vitality.

from The Century Dictionary.

• To fill with marrow or with fat.
• noun 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.
• To associate with; hence, to match; fit.
• Soft; tender.
• noun 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.
• noun The pith of plants.
• noun The pulp of fruits.
• noun Figuratively, the inner substance; the essence; the essential strength; the inner meaning, purpose, etc.; the pith.
• noun The alligator-pear. See avocado.

from the GNU version of the Collaborative International Dictionary of English.

• noun (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.
• noun The essence; the best part.
• noun Scot. One of a pair; a match; a companion; an intimate associate.
• noun (Bot.) a name given to several varieties of squash, esp. to the Boston marrow, an ovoid fruit, pointed at both ends, and with reddish yellow flesh, and to the vegetable marrow, a variety of an ovoid form, and having a soft texture and fine grain resembling marrow.
• noun (Anat.) See Spinal cord, under Spinal.
• transitive verb To fill with, or as with, marrow or fat; to glut.

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

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

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

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