γαρίτιον
From LSJ
ἔγνω δὲ φώρ τε φῶρα καὶ λύκος λύκον → the thief knows the thief and the wolf knows the wolf, and thief knows thief and wolf his fellow wolf, set a thief to catch a thief
Spanish (DGE)
-ου, τό
prob. tarro de garo, PVindob.inv.G 10739.8 (VI d.C.) en Anal.Pap.2.1990.102 (pero quizá graf. por γαρίδιον q.u.).