1. (Science: anatomy) 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 colour.
3. [OE. Maru, maro; perh. A different word; cf. Gael. Maraon together] One of a pair; a match; a companion; an intimate associate. Chopping and changing i can not commend, With thief or his marrow, for fear of ill end.
Origin: oe. Marou, mary, maruh, as. Mearg, mearh; akin to os. Marg, D. Merg, g. Mark, OHG. Marg, marag, Icel. Mergr, Sw. Merg, dan. Marv, Skr. Majjan; cf. Skr. Majj to sink, L. Mergere. Cf. Merge. The fatty network of connective tissue that fills the cavities of bones.Very tender and very nutritious tissue from marrowbones.