κυβοστόν
From LSJ
οὐ δικαίως θάνατον ἔχθουσιν βροτοί, ὅσπερ μέγιστον ῥῦμα τῶν πολλῶν κακῶν → unjustly men hate death, which is the greatest defence against their many ills | men are not right in hating death, which is the greatest succour from our many ills
English (LSJ)
(sc. μόριον), τό, reciprocal of a cubed number, fraction corresponding to κύβος, i.e. 1/x3, Dioph.1 Def.3.