Source : Webster's Revised Unabridged Dictionary (1913)

Medullary \Med"ul*la*ry\, a. [L. medullaris, fr. medulla marrow:
   cf. F. m['e]dullaire.]
   1. (Anat.)
      (a) Pertaining to, consisting of, or resembling, marrow or
          medulla.
      (b) Pertaining to the medula oblongata.

   2. (Bot.) Filled with spongy pith; pithy.

   {Medullary groove} (Anat.), a groove, in the epiblast of the
      vertebrate blastoderm, the edges of which unite, making a
      tube (the medullary canal) from which the brain and spinal
      cord are developed.

   {Medullary rays} (Bot.), the rays of cellular tissue seen in
      a transverse section of exogenous wood, which pass from
      the pith to the bark.

   {Medullary sheath} (Anat.), the layer of white semifluid
      substance (myelin), between the primitive sheath and axis
      cylinder of a medullated nerve fiber.

Source : WordNet®

medullary
     adj 1: containing or consisting of or resembling bone marrow
     2: of or relating to the medulla oblongata
     3: of or relating to the medulla of any body part