'tweenbrain

noun

'tweenbrain

noun

Etymology From 'tween + brain.

1

Anatomy, Medicine, Neuroanatomy, Neurology, Neuroscience, Sciences Dated Synonym of diencephalon.

Deep within the brain is a biologically ancient section called the diencephalon or tweenbrain.1931, Medicine: Tweenbrain & Stomach:
The brainstem constituents include the medulla oblongata, pons varolii, midbrain, and tweenbrain.2007, Robb S. Rehberg, Sports Emergency Care: A Team Approach:

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.