Entry 1 sense Webster, 1913 Myelonal · My·e·lo·nal · IPA /ˈmaɪəˌləʊnəl/ 01 a. Of or pertaining to the myelon; as, the myelonal, or spinal, nerves. 1. Of or pertaining to the myelon; as, the myelonal, or spinal, nerves.(Anat.)