MESENCEPHALON
midbrain, mesencephalon
(noun) the middle portion of the brain
Source: WordNet® 3.1
Etymology
Noun
mesencephalon (plural mesencephalons or mesencephala)
A part of the brain located rostral to the pons and caudal to the thalamus and the basal ganglia, composed of the tectum (dorsal portion) and the tegmentum (ventral portion).
Synonyms
• midbrain
Meronyms
• tectum
• tegmentum
Source: Wiktionary
Mes`en*ceph"a*lon, n. Etym: [NL. See Meso- and Encephalon.] (Anat.)
Definition: The middle segment of the brain; the midbrain. Sometimes
abbreviated to mesen. See Brain.
Source: Webster’s Unabridged Dictionary 1913 Edition