Talk:psoas

The etymology of psoas is given as:
From Ancient Greek ψόας (psóas, “muscles of the loins”), genitive singular of ψόα (psóa).

But I cannot find ψόα in any ancient Greek dictionary. See, for example, https://www.perseus.tufts.edu/hopper/morph?l=yoa&la=greek#lexicon

There is a word ψώα, but it does not mean muscle of the loin. LSJ gives:
ψώα , ἡ,
A.rottenness, putrid stench, A.R.Fr.5: but ψῶα: μέρος περὶ τὸν ὦμον, Hdn.Epim.155. ψωδαρέον: αὐχμηρόν, Hsch. (ψωραλέον Ruhnk.).
https://www.perseus.tufts.edu/hopper/morph?l=ywa&la=greek#Perseus:text:1999.04.0057:entry=yw/a-contents
Note that the phrase after "but" translates to: part around the shoulder.

So, the etymology of psoas is unclear.

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After more searching, I have found a definition of psoa:

ψόα or ψύα , ἡ, more freq. in pl. ψόαι or ψύαι,

A.muscles of the loins (cf. ἀλώπηξ IV), Hp.Art.45 (ψύας codd.MV), Nat.Hom.11 (ψόας), cf. Oss. 18 (ψύαν), Morb.Sacr.3 (ψύην), and LXX Le.3.9, 2 Ki.2.23, Ps.37(38).8, al.; “ψύαι” Euphro 7, Clearch.72, Aret.CD2.3 (but “ψόαι” Id.SD2.3); acc. pl. ψοιάς (v.l. ψύας, ψυάς) Polybus ap.Arist.HA512b21: “ψόα” LXX Le. l.c. and three times in cod. Vat. of 2 Ki. (cod.Alex. ψοία）; ψύαι Ps. l.c. (corrupted to ψυχή): acc. pl. ψόας in Bilabel “Ὀψαρτ.” p.11:—Hsch. has ψίαι, ψειαί, and ψυῖαι, also φοῦαι and ψύλλες: the word in all its spellings is declared un-Attic by Phryn.269, Phot.; the form ψύη was recognized by Irenaeus ap. Orion.col.168. [υ^ in ψύαι, Euphro l. c.; but υ_ in an Epic Fragm. in Ath.9.399a, ψύας ἔγχεϊ νύξε, where perh. ψοίας shd. be written.]

Henry George Liddell. Robert Scott. A Greek-English Lexicon. revised and augmented throughout by. Sir Henry Stuart Jones. with the assistance of. Roderick McKenzie. Oxford. Clarendon Press. 1940.

So, I'm now convinced.