boston marrow
Webster's Dictionary (GCIDE)
1.(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. [1913 Webster]
2.The essence; the best part. [1913 Webster]
It takes from our achievements . . . The pith and marrow of our attribute.— Shak.[1913 Webster]
3.[OE. maru, maro; -- perh. a different word; cf. Gael. maraon together.] One of a pair; a match; a companion; an intimate associate. [Scot.] [1913 Webster]
Chopping and changing I can not commend, With thief or his marrow, for fear of ill end.— Tusser.[1913 Webster]
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. [1913 Webster]