Might mean (unverified): Neurological development phase in preteens.
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We found one dictionary that defines the word tweenbrain:

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  1. 'tweenbrain: Wiktionary

Definitions from Wiktionary (Tweenbrain)

noun:  Alternative form of 'tweenbrain [(neuroanatomy) The region of the human brain, specifically the human forebrain, that includes the thalamus, the hypothalamus, the epithalamus, the prethalamus or subthalamus, and the pretectum.]


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