diencephalon
noun
di·en·ceph·a·lon
ˌdī-ən-ˈse-fə-ˌlän 
ˌdī-(ˌ)en-,
-lən
: the posterior subdivision of the forebrain
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This gene is involved in brain development and is mostly expressed in a part of the brain called the diencephalon — an area previously found to differ in gay men.
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Leah Froats, Discover Magazine, 7 Dec. 2017
Cite this Entry
“Diencephalon.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/diencephalon. Accessed 3 Nov. 2025.
Copy CitationMedical Definition
diencephalon
noun
di·en·ceph·a·lon
ˌdī-ən-ˈsef-ə-ˌlän
ˌdī-(ˌ)en-
ˌdī-(ˌ)en-
-lən
: the posterior subdivision of the forebrain
called also betweenbrain, interbrain
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