pruinis
pruinis is a Latin form of pruina, meaning “hoarfrost; winter”. It is the ablative plural feminine noun or dative plural feminine noun.
Found 29 times in the Latin texts on Socratos.
Where it is used
Vergil, Georgics 3.368: intereunt pecudes, stant circumfusa pruinis
All forms of pruina (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.