ἕργμα

ατος, τό
A. , (εἵργὠ fence, guard, Arist. PA 658b18 ; τάφου S. Ant. 848 (lyr.); obstacle, Hp. Steril. 213 ; means of hindering, δυνάμεως Hierocl. in CA 24p.473M.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
An open-access project