Definition of métissage in English:
métissage
noun ˌmeɪtiːˈsɑːʒˈmeɪtiːsɑːʒmeɪˈtiːsɑːʒ
Cross-breeding, miscegenation.
Origin
Late 19th century; earliest use found in Journal of the Royal Anthropological Institute. From French métissage from métis + -age.