LSJ
τά, Psyra, a barren islet near Chios, taken as the type of what is insignificant; prov., Ψύρα τὸν Διόνυσον ἄγοντες (saying ΄a fig for Dionysus!΄), of persons who drink no wine, Cratin. 352; Ψύρα τε τὴν Σπάρτην ἄγεις Id. 112; also called ψυρίη, ἡ, Od. 3.171.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)