mesencephalic mes·en·ce·phal·ic (měz'ěn-sə-fāl'ĭk, měs'-)
adj.
Of or relating to the mesencephalon.
mesencephalon mes·en·ceph·a·lon (měz'ěn-sěf'ə-lŏn', měs'-)
n.
The portion of the vertebrate brain that develops from the middle section of the embryonic brain. Also called midbrain.