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Latin word *barra comes from Proto-Indo-European *bʰrewh₁-, Gaulish *barros, Proto-Indo-European *bʰrewe-
*bʰrewh₁- (Proto-Indo-European)
*barros (Gaulish)
*bʰrewe- (Proto-Indo-European)
*barra (Latin)
(Vulgar Latin) bar. (Vulgar Latin) barrier.
*bʰēr- (Proto-Indo-European)