'Mesencephalon' definitions:

Definition of 'mesencephalon'

noun

The middle portion of the brain [syn: midbrain, mesencephalon]

Definition of 'Mesencephalon'

From: GCIDE

Mesencephalon \Mes`en*ceph"a*lon\, n. [NL. See Meso- and Encephalon.] (Anat.) The middle segment of the brain; the midbrain. Sometimes abbreviated to mesen. See Brain. [1913 Webster]

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