Bailly
ης (ἡ) v. πέρατος.
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LSJ
ἡ, fem. of πέρατος (wh. is not found) (sc. χώρα), farthest quarter, extremity of the heavens, whether East, A.R. 1.1281, or (more freq.) West, Od. 23.243, Call. Del. 169. of the southern hemisphere, Arat. 499.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)