1. Inflammation of the spinal cord, often part of a more specifically defined disease process.

One group of diseases is named according to whether primarily white matter or gray matter is affected; another group is defined by whether there is coexistent disease of the meninges (meningomyelitis) or the brain (encephalomyelitis). In practice, the term is also used to denote noninflammatory lesions of the spinal cord.
2. Inflammation of the bone marrow.