παρασφήνιον
From LSJ
ἐάν μή διδάξητε περί ἀρετὴς τούς τό ἀργύριον κλέψαντας, οὐ ταξόμεθα οἱ ὁπλῖται → if you don't teach those who have stolen money a lesson on moral virtue, we, the hoplites, will not line up
English (LSJ)
τό,
A side-block for wedging, IG11(2).159 A 38 (Delos, iii B.C.), PCair.Zen.759 (iii B.C.).