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n. pl. arch·en·ceph·a·la (-lə)
The part of the primitive embryonic brain from which the forebrain and midbrain develop.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(ˌɑr kɛnˈsɛf əˌlɒn)

n., pl. -lons, -la (-lə)
the primitive forebrain region of the embryo that is anterior to the notochord and gives rise to the midbrain and forebrain.
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