Med"ul*la*ry (?), a. [L. medullaris, fr. medulla marrow: cf. F. m'edullaire.]
1. Anat. (a)
Pertaining to, consisting of, or resembling, marrow or medulla.
Pertaining to the medula oblongata.
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.
© Webster 1913.