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Latin word frater comes from Proto-Indo-European *bʰreh₂trós, and later Proto-Italic *frātēr (Brother.)
*bʰreh₂trós (Proto-Indo-European)
*frātēr (Proto-Italic)
Brother.
frater (Latin)
(Ecclesiastical Latin) brother, brethren; member of a religious community. Brother. Friend, lover. Sibling.