antris
antris is a Latin form of antrum, meaning “cave, cavern”. It is the ablative plural neuter noun.
Found 74 times in the Latin texts on Socratos.
Where it is used
Vergil, Georgics 4.509: flesse sibi et gelidis haec evolvisse sub antris
All forms of antrum (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.