insulis
insulis is a Latin form of insula, meaning “island; apartment block”. It is the ablative plural feminine noun.
Found 32 times in the Latin texts on Socratos.
Where it is used
Caesar, De Bello Gallico 4.10.4: ubi Oceano adpropinquavit, in plures diffluit partes multis ingentibus insulis effectis, quarum pars magna a feris barbaris nationibus incolitur,
All forms of insula (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.