fenestras
fenestras is a Latin form of fenestra, meaning “window; opening”. It is the accusative plural feminine noun.
Found 26 times in the Latin texts on Socratos.
Where it is used
Caesar, De Bello Civili 2.9·2: … mam contabulationem storiasque elevabant. Ita tuto ac sine ullo vulnere ac periculo sex tabulata exstruxerunt fenestrasque, quibus in locis visum est, ad tormenta mittenda in struendo reliquerunt.
All forms of fenestra (declension table)
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.