epitheca
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)
ĕpĭthēca: ae, f., = ἐπιθήκη,
I an addition, increase, Plaut. Trin. 4, 3, 18.