\Mar"row\, n. [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. [root]274 Cf. {Merge}.]
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.
2. The essence; the best part.
         It takes from our achievements . . . The pith and
         marrow of our attribute.              --Shak.
3. [OE. maru, maro; -- perh. a different word; cf. Gael.
   maraon together.] 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}.

\Mar"row\, v. t. [imp. & p. p. {Marrowed}; p. pr. & vb.
n. {Marrowing}.]
To fill with, or as with, marrow of fat; to glut.