单词 amyelia 释义 amyelia, n. Path.|email|[f. Gr. ἀ without marrow: + -ia1; cf. a- 14, myelin n.1]Congenital absence of the spinal cord.1865Med. Press (Dublin) XI. 435/2 The appearance of the spinal nerves at the neural foramina in the absence of the sp...