ethnogamy means endogamy specific to ethnicity; the social practice of marriage restricted to one's own ethnicity.
Etymology
From ethno- + -gamy.
noun
- Endogamy specific to ethnicity; the social practice of marriage restricted to one's own ethnicity.“For convenience, this plane and the mode of marriage defining it may, in special allusion to the correlative race-sense, be styled ethnogamy; and the more systematic characters of this mode and plane of marriage may be outlined briefly:”