Rhinencephalon
Rhinencephalon (rī`nen*sef"ȧ*lon) , noun
[New Latin, from Greek "ri`s, "rino`s, the nose + 'egke`falos the brain.]
(Anatomy) The division of the brain in front of the prosencephalon, consisting of the two olfactory lobes from which the olfactory nerves arise.
The term is sometimes used for one of the olfactory lobes, the plural being used for the two taken together.