noun, plural diencephalons, diencephala [dahy-en-sef-uh-luh] . Anatomy.
the posterior section of the forebrain.

1880–85; < Neo-Latin; see di-3, encephalon

diencephalic [dahy-en-suh-fal-ik] , adjective
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World English Dictionary
diencephalon (ˌdaɪɛnˈsɛfəˌlɒn)
the part of the brain that includes the basal ganglia, thalamus, hypothalamus, and associated areas

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American Heritage
Medical Dictionary

diencephalon di·en·ceph·a·lon (dī'ěn-sěf'ə-lŏn', -lən)
The posterior part of the prosencephalon, composed of the epithalamus, the dorsal thalamus, the subthalamus, and the hypothalamus. Also called betweenbrain, interbrain.

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Example sentences
The diencephalon is located in the core of the brain.
He wares his hair so short you can tickle his diencephalon.
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