prosencephalon

n. forebrain, section of the brain that includes the cerebrum thalamus and hypothalamus (Anatomy)

In the anatomy of the brain of vertebrates, the prosencephalon (or forebrain) is the rostral-most portion of the brain. The prosencephalon, the mesencephalon (midbrain), and rhombencephalon (hindbrain) are the three primary portions of the brain during early development of the central nervous system.
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Prosencephalon /pros·en·ceph·a·lon/ forebrain. 1. the part of the brain developed from the anterior of the three primary brain vesicles, comprising [more]Prosencephalon - Community and Resources

Noun
1. the anterior portion of the brain; the part of the brain that develops from the anterior part of the neural tube
(synonym) forebrain
(hypernym) neural structure
(part-holonym) brain, encephalon
(part-meronym) peduncle, cerebral peduncle

(n.)
The cerebrum.
  

(n.)
The anterior segment of the brain, including the cerebrum and olfactory lobes; the forebrain.