marrow

marrow is a Noun

Definition:

[1] 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] The essence; the best part. It takes from our achievements . . . The pith and marrow of our attribute. Shak.

[3] One of a pair; a match; a companion; an intimate associate. [Scot.] Chopping and changing I can not commend, With thief or his marrow, for fear of ill end. Tusser. Marrow squash (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. -- Spinal marrow. (Anat.) See Spinal cord, under Spinal.