Bailly
ων (τὰ) v. Πύθιος.
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LSJ
(sc. ἱερά), τά, the Pythian games, celebrated at Delphi in honour of Pythian Apollo, ἐν Πυθίοισι νικᾶν Pi. N. 2.9; Π. ἀνελόμενος Hdt. 6.122; ἐνίκα τὰ Π. τῷ τεθρίππῳ D. 59.33; also of festivals elsewhere, IG 3.129, etc.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)