Me-dŭl'lar or Mĕd'ul-la-ry, a.
(Synop., § 130), a. [Lat. medullaris, from medulla, marrow, from medius, middle; Fr. médullaire, Pr. medullar, Sp. medular, It. midollare.]
- Pertaining to marrow; consisting of marrow; resembling marrow; as, medullary substance.
- (Bot.) Filled with spongy pith; pithy.
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, a thin layer of vascular tissue surrounding the pith.