δέρρις
From LSJ
τέχνη δὲ ἄνευ ἀλκῆς οὐδὲν ὠφελεῖ (Thucydides 2.87.4.6) → η τέχνη απαιτεί κουράγιο, skill without heart is useless
English (LSJ)
εως, ἡ, (Att. form of Δέρσις, cf. δέρω)
A skin, δ. τριχίνη LXX Za.13.4, cf. AP12.33 (Mel.). II leathern covering, of a jerkin, Eup.328; of a curtain, Pl.Com.240, Myrtil.1. III in pl. (sg., Ph.Bel.95.34), screens of skin or hide, hung before fortifications to deaden the enemy's missiles, Th.2.75, Cic.Att.4.19.1, D.S.20.9, Apollod.Poliorc.142.2, Polyaen.3.11.13: generally, curtain, LXXEx. 26.7, al., IG5(1).1390.35 (Andania, i B. C.).