adulterii
adulterii is a Latin form of adulterium, meaning “adultery”. It is the genitive singular neuter noun.
Found 36 times in the Latin texts on Socratos.
Where it is used
Ovid, Amores 3.5.44: Pectus adulterii labe carere negant.'
All forms of adulterium (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.