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French word croix comes from Proto-Indo-European *kor-, and later Old French crois (Cross. Crossroads.)
*kor- (Proto-Indo-European)
crux (Latin)
(derogatory) gallows bird; one who deserves to be hanged. (figuratively) torture; misery. Wooden frame on which criminals were crucified, especially a cross.
crois (Old French)
Cross. Crossroads.
croix (Middle French)
Cross.
croix (French)
(heraldiccharge) a representation of a cross; the cross as a heraldic symbol. Cross (shape).