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archencephalon

[ahr-ken-sef-uh-lon] /ˌɑr kɛnˈsɛf əˌlɒn/
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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Based on the Random House Dictionary, © Random House, Inc. 2014.
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