Zera Yisrael
Zera Yisrael (Hebrew: זרע ישראל, lit. 'Seed [of] Israel'), also known as Zera Kadosh (lit. 'Seed [of] Holiness'), is a legal category in Halakha that denotes the blood descendants of Jews who, for one reason or another, are not legally Jewish according to religious criteria. This is usually due to a lack of matrilineal Jewish ancestry.