Onus
From BiblePortal Wikipedia
Hastings' Dictionary of the Bible [1]
ONUS ( 1Es 5:22 ) = Ono (wh. see).
Webster's Dictionary [2]
(n.) A burden; an obligation.
Cyclopedia of Biblical, Theological and Ecclesiastical Literature [3]
( ᾿Ωνούς ) , a corrupt Graecized form ( 1 Esdras 5:22) of the name of the town ONO (See Ono) (q.v.).