brother; sister
Ancient Greek word, found 17 times in the texts on Socratos.
Euripides, Medea 167: αἰσχρῶς τὸν ἐμὸν κτείνασα κάσιν.
Euripides, Hecuba 428: ὅ τʼ ἐν φιλίπποις Θρῃξὶ Πολύδωρος κάσις.
Sophocles, Oedipus at Colonus 1440: εἰς προὖπτον Ἅιδην οὐ καταστένοι, κάσι;