χέρνιβον
From LSJ
ἵνα οὖν μηδ' ἐν τούτῳ δῷ αὐτοῖς λαβήν (Photius, Fragments on the Epistle to the Romans 483.26) → so that he doesn't give them even here a handle (= an opportunity for refutation)
English (LSJ)
τό,
A = χερνιβεῖον, Il.24.304, IG11(2).144A32 (Delos, iv B. C.), cf. Hdn.Gr.1.378: pl. χέρνιβα Philostr.Im.2.23.