proavia
From LSJ
Ubi idem et maximus et honestissimus amor est, aliquando praestat morte jungi, quam vita distrahi → Where indeed the greatest and most honourable love exists, it is much better to be joined by death, than separated by life.
Latin > English (Lewis & Short)
prŏ-ăvĭa: ae,
I f, a grandfather's or grandmother's mother, a great-grandmother (post-Aug.), Suet. Calig. 10; cf. Dig. 38, 10, 1; 10.