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mesencephalon
CIDE DICTIONARY
The middle segment of the brain; the midbrain. Sometimes abbreviated to mesen . See Brain. [1913 Webster]
OXFORD DICTIONARY
mesencephalon, n. the part of the brain developing from the middle of the primitive or embryonic brain. Also called MIDBRAIN.
Etymology
Gk mesos middle + encephalon brain: see ENCEPHALIC
For further exploring for "mesencephalon" in Webster Dictionary Online