The brain; a variant or older term for the encephalon or brain tissue.
From Greek 'enkephalon' (within the head), from en- (in) + kephale (head). Variant of 'encephalon,' the standard medical term.
This Greek-derived term shows how medical terminology split into slightly different forms—'encefalon' and 'encephalon' mean the same thing, but modern medicine standardized on 'encephalon'!
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