rhinencephalon
Rhi`nen*ceph"a*lon, n.; pl. Rhinencephala. Etym: [NL., fr. Gr. (Anat.) Defn: The division of the brain in front of the prosencephalon, consisting of the two olfactory lobes from which the olfactory nerves arise. Note: The term is sometimes used for one of the olfactory lobes, the plural being used for the two taken together.