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Italian word blu comes from Proto-Indo-European *bʰleh₁-, Proto-Indo-European *bʰlēw, and later Proto-Germanic *blēwaz (A dark bluish or grey colour, black. Blue.)
*bʰleh₁- (Proto-Indo-European)
*bʰlēw (Proto-Indo-European)
*bʰlē-wo- (Proto-Indo-European)
*bʰlewas (Proto-Indo-European)
light-coloured, blond, yellow
*blēwaz (Proto-Germanic)
A dark bluish or grey colour, black. Blue.
*blāo (Frankish)
blāo (Frankish)
*blāw (Frankish)
Blue.
*blavus (Vulgar Latin)
*blavus (Latin)
Blue.
bleu (Old French)
bleu (Middle French)
Blue Blue.
blu (Italian)
Blue The colour blue.