We don't have synonyms for myeloidin yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are myeloid and xyloidin.
(n) :
(biochemistry) A substance present in the protoplasm of the retinal epithelium cells, and resembling, if not identical with, the myelin that forms the medullary sheaths of nerve fibres.
(n) :
(biochemistry) A substance present in the protoplasm of the retinal epithelium cells, and resembling, if not identical with, the myelin that forms the medullary sheaths of nerve fibres.