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ου (ὁ, ORPH. Arg. 1364 ; ἡ, PD. P. 78, 310) c. Ταίναρον.
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LSJ
ἡ, Taenarus, a promontory at the southern end of Laconia, Pi. P. 4.44, 174; also masc. or neut., Th. 1.128, 133, 7.19; Ταίναρον ἠνεμόεντα Orph. A. 1370; neut. Ταίναρον, τό, Str. 8.5.1; in most passages the word occurs in an obl. case without an Adj., so that the gender is undetermined, as in h.Ap. 412, Hdt. 1.23, 24, Th. 1.133, Ar. Ra. 187, etc. ; Ποσειδῶν οὑπὶ Ταινάρῳ θεός Id. Ach. 510; πύλη τις ἐστὶ (sc. of the infernal regions) Ταινάρου πρὸς ἐσχάτοις Men. 842, cf. Str. l.c. ; — Adj. Ταινάριος, α, ον, Ταιναρίην ὑπὸ χθόνα A.R. 1.102; epith. of Artemis, Euph. 9.11; Τ. λίθος, v. λίθος II. 1.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)