Noah Webster's New International Dictionary of the English Language
1. (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.
2. (n.) The essence; the best part.
3. (n.) One of a pair; a match; a companion; an intimate associate.
4. (v. t.) To fill with, or as with, marrow of fat; to glut.