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From: Webster's Revised Unabridged Dictionary (1913)

 Med·ul·la·ry a.
 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.
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