thalamencephalon
Noun
Meaning
The segment of the brain next in front of the midbrain, including the thalami, pineal gland, and pituitary body; the diencephalon; the interbrain.
Source: Webster's dictionarySynonyms
interbrain
diencephalon
betweenbrain
Webster's Dictionary
Webster's Revised Unabridged Dictionary
interarain