ἱλαστήριον

English (Strong)

neuter of a derivative of ἱλάσκομαι; an expiatory (place or thing), i.e. (concretely) an atoning victim, or (specially) the lid of the Ark (in the Temple): mercyseat, propitiation.

Russian (Dvoretsky)

ἱλαστήριον: τό1) умилостивительная жертва NT;
2) очистилище, золотая крышка или навес над Ковчегом Завета NT.