Me-dūl'la, n.

n. [Lat.] 1. Marrow; pith; hence, essence. [Obs.] Milton.

2. (Anat.) A fatty substance contained in the cavities of bones; marrow.
3. (Bot.) A soft, cellular tissue, occupying the center of the stem or branch of a plant; pith.

Medulla oblongata (Anat.), one of the divisions of the brain. It constitutes the upper or cranial portion of the spinal cord, and controls the function of respiration.—Medulla spinalis, the spinal cord.