a rare type of malignant tumor, found in some young children, that is formed from embryonic nerve cells
See neuroblastoma in American Heritage Dictionary 4
(no͝orˌō-blă-stōˈmə, nyo͝orˌ-)
nounpl.neu·ro·blas·to·mas or neu·ro·blas·to·ma·ta(-mə-tə)
A malignant tumor composed of neuroblasts, originating in the autonomic nervous system or the adrenal medulla and occurring chiefly in infants and young children.