Hypertext Webster Gateway: "mesen"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
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}.
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