νέρθεν (nerthen)
νέρθεν is an Ancient Greek form of ἔνερθε, meaning “beneath”. It is the preposition.
Found 42 times in the Ancient Greek texts on Socratos.
Where it is used
Apollonius Rhodius, Argonautica 1.745: νέρθεν ὑπὲκ μαζοῖο· τὸ δʼ ἀντίον ἀτρεκὲς αὔτως
Source: Socratos (socratos.org), a free reader for Ancient Greek and Latin. Grammar from the Perseus Treebank and Morpheus; dictionary entries from Liddell-Scott-Jones, A Greek-English Lexicon (Perseus Digital Library, CC BY-SA). Counts are from the texts on Socratos.