Bailly
ων (τὰ) c. Πυανέψια, LYCURG. (HARP.).
Bailly 2020 Hugo Chávez Gérard Gréco, André Charbonnet, Mark De Wilde, Bernard Maréchal & contributeurs / Licence Creative Commons Attribution - Pas d'Utilisation Commerciale - Pas de Modification — « CC BY-NC-ND 4.0 »
LSJ
(sc. ἱερά), τά, an Athenian festival in the month Πυανοψιών, in honour of Apollo, Lycurg. Fr. 84; elsewh. written Πυανέψια (cf. Πυανοψιών) and expld. fr. πύανον ἕψειν, of a dish of beans cooked and offered, Plu. Thes. 22, Ath. 10.408a, etc. ; acc. to Lycurg. l.c. the other Greeks called it Πανόψια (Πανοψίαν codd.).
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)