istaec
istaec is a Latin form of iste, meaning “that (of yours), that; such”. It is the nominative plural neuter pronoun or accusative plural neuter pronoun.
Found 170 times in the Latin texts on Socratos.
Where it is used
Cicero, Letters to Atticus 8.12C.1: … Caesarem et, si secundum mare ad me ire coepisset, confestim in Samnium ad me venturum, sin autem ille circum istaec loca commoraretur, te ei, si propius accessisset resistere velle. te animo magno et forti istam rem agere exi …
Terence, Phormio 3.3.558b: Istaec vero vilis est.
Plautus, Asinaria 5.1.843: quia istaéc est tecum. atque ego quidem hercle ut verum tibi dicam, pater,
Source: Socratos (socratos.org), a free reader for Ancient Greek and Latin. Grammar from the Perseus Treebank and Morpheus; dictionary entries from Lewis & Short, A Latin Dictionary (Perseus Digital Library, CC BY-SA). Counts are from the texts on Socratos.