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archencephalon

[ahr-ken-sef-uh-lon]
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noun Embryology.
  1. the primitive forebrain region of the embryo, anterior to the notochord, that gives rise to the midbrain and forebrain.
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Origin of archencephalon

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018