ἀδελφότεκνον

From LSJ

κεντέω τὸν πῶλον περὶ τὴν νύσσαν → of impetuous haste, goad the foal around the turning post

Source

Spanish (DGE)

-ου, τό
sent. dud. sobrino o primo, Klein.Türsteine 372 (Frigia III d.C.)
sobrino, IPhrygie 4.47.6 (crist.).