Great-grandfather
The father of the grandfather; "rabba" means "great".
("Everyone at Abba Rabbah’s house called him!" — Yevamot 21b; and likewise: "And do you mean his son and his grandson, to the end of all generations? Rather, say: his daughter’s daughter-in-law, as Rav Chisda said: I heard this matter from a great man" — Yevamot 21b)
Translation
Expression (Hebrew)
סַבָּא רַבָּא, סַבָּא רַבָּה
Definition (Hebrew)
הָאָב שֶׁל הַסָּב (רָבָא מַשְׁמָע גָּדוֹל).
("כֻּולְּהוּ דְּבֵי אַבָּא רַבָּה קָרוּ לֵיהּ! "-יְבָמוֹת כא ע"ב, וְכֵן:"וְכֵן אַתָּה אוֹמֵר בִּבְנוֹ וּבֶן בְּנוֹ עַד סוֹף כָּל הַדּוֹרוֹת! אֶלָּא אִמָּא: כַּלַּת בִּתּוֹ, דְּאָמַר רַב חִסְדָּא: הָא מִלְּתָא מִגַּבְרָא רַבָּה שְׁמִעַ לִי"- יְבָמוֹת כא ע"ב)