dei
dei is a Latin form of deus, meaning “god”. It is the genitive singular masculine noun or nominative plural masculine noun.
Found 600 times in the Latin texts on Socratos.
Where it is used
Cicero, De Natura Deorum 1.3: … i ita sunt, si animadvertuntur ab is et si est aliquid a deis inmortalibus hominum generi tributum; sin autem dei neque possunt nos iuvare nec volunt nec omnino curant nec quid agamus animadvertunt nec est quod ab is ad hom …
Horace, Ars Poetica 239: an custos famulusque Dei Silenus alumni.
All forms of deus (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.