ψηφίς
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)
ῖδος (cf. Hdn.Gr.2.186), ἡ, Dim. of ψῆφος,
A small pebble, Il.21.260, Lex Solonis ap.Sch.Gen.Il.l.c., Democr.164, Luc.DMar.3.2. 2 pebble for reckoning, AP11.365 (Agath.). 3 tessellated work, Chor.p.86B. II gem or amulet worn in a ring, Long us 4.17, Alex.Trall. 11.1.