From Middle English brayn, brain, from Old English bræġn ("brain"), from Proto-Germanic *bragną ("brain"), from Proto-Indo-European *mregʰnom ("skull, brain"), from Proto-Indo-European *mregʰ- ("marrow, sinciput") + *men-. Cognate with Scots braine, brane, North Frisian brayen, brein, Saterland Frisian Brainge ("brain"), West Frisian brein ("brain"), Dutch brein ("brain"), Low German Brägen, Bregen (whence German Bregen ("animal brain")), Ancient Greek βρεχμός ("front part of the skull, top of the head").
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