myelitisEtymologyFrom myelo- + -itis. From Ancient Greek μυελός (muelós, “marrow”) + -ῖτις (-îtis, “fire”).myelitis means inflammation of the spinal cord or of bone marrow. Lexicurio rates it Rare gem — a strength score of 84 out of 100.nounInflammation of the spinal cord or of bone marrow.