πτέρνης

From LSJ

πᾶσα γυνὴ τοῦ λύχνου ἀρθέντος ἡ αὐτή ἐστι → all women are the same in the dark, all women are the same when the lights go out

Source

Russian (Dvoretsky)

πτέρνης: εως ὁ v. l. = πτέρνις.