/ Dictionary / Index N neural tube: Meaning and Definition of Find definitions for: neu'ral tube' Pronunciation: [key] — Embryol. Embryol. a tube formed by the closure of ectodermal tissue in the early vertebrate embryo that later develops into the brain, spinal cord, nerves, and ganglia. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. neural network neural tube defect Related Content Daily Word Quiz: agitated Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language