Pronunciation: (noor"ō-bla-stō'mu, nyoor"-), [key]
—pl. -mas, -ma•taPronunciation: (-mu-tu). [key] Pathol.
a malignant tumor of immature nerve cells that usually starts in the autonomic nervous system or adrenal gland and spreads quickly, most often affecting young children.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.