From the form ξάδελφος (xádelfos), from εξάδελφος (exádelfos), from Koine Greek ἐξάδελφος (exádelphos), from Ancient Greek ἐξ- (ex-) + ἀδελφός (adelphós).
ξάδερφος • (xáderfos) m (plural ξάδερφοι, feminine ξαδέρφη)
| singular | plural | |
|---|---|---|
| nominative | ξάδερφος (xáderfos) | ξάδερφοι (xáderfoi) |
| genitive | ξάδερφου (xáderfou) ξαδέρφου (xadérfou) |
ξάδερφων (xáderfon) ξαδέρφων (xadérfon) |
| accusative | ξάδερφο (xáderfo) | ξάδερφους (xáderfous) ξαδέρφους (xadérfous) |
| vocative | ξάδερφε (xáderfe) | ξάδερφοι (xáderfoi) |
Second forms are formal.