n.
Pronunciation: ' h ī n(d)- ˌ br ā n
Function: noun
Date: 1888
1 : the posterior of the three primary divisions of the developing vertebrate brain or the corresponding part of the adult brain that includes the cerebellum, the medulla oblongata, and in mammals the pons and that controls autonomic functions and equilibrium ― called also rhombencephalon ― compare METENCEPHALON , MYELENCEPHALON
2 : the posterior segment of the brain of an invertebrate