The Collaborative International Dictionary of English v.0.48:
Myelitis \My`e*li"tis\, n. [NL., from Gr. myelo`s marrow + -itis.] (Med.) 1. Inflammation of the spinal marrow or its membranes. [1913 Webster] 3. Inflammation of bone marrow. [PJC]WordNet (r) 3.0 (2006):
myelitis n 1: inflammation of the spinal cord