pĕrendĭē — Lewis & Short
pĕrendĭē, adv.Gr. pe/ran-dies,
I on the day after to-morrow (class.):
cras agito, perendie agito,Plaut. Merc. 2, 3, 41; id. Aul. 2, 1, 34; id. Stich. 4, 1, 12:
scies igitur fortasse cras, summum perendie,Cic. Att. 12, 44, 3; id. Fam. 16, 17, 3.