Definition of marrow

• n. - 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.
• n. - The essence; the best part.
• n. - One of a pair; a match; a companion; an intimate associate.
• v. t. - To fill with, or as with, marrow of fat; to glut.