Marrow

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.

The essence; the best part.

One of a pair; a match; a companion; an intimate associate.

To fill with, or as with, marrow of fat; to glut.

the choicest or most essential or most vital part of some idea or experience; "the gist of the prosecutor's argument"; "the heart and soul of the Republican Party"; "the nub of the story"

any of various squash plants grown for their elongated fruit with smooth dark green skin and whitish flesh

very tender and very nutritious tissue from marrowbones