Strong's #2435: hilasterion (pronounced hil-as-tay'-ree-on)

neuter of a derivative of 2433; an expiatory (place or thing), i.e. (concretely) an atoning victim, or (specially) the lid of the Ark (in the Temple):--mercyseat, propitiation.

Thayer's Greek Lexicon:

̔́

hilastērion

1) relating to an appeasing or expiating, having placating or expiating force, expiatory; a means of appeasing or expiating, a propitiation

1a) used of the cover of the ark of the covenant in the Holy of Holies, which was sprinkled with the blood of the expiatory victim on the annual day of atonement (this rite signifying that the life of the people, the loss of which they had merited by their sins, was offered to God in the blood as the life of the victim, and that God by this ceremony was appeased and their sins expiated); hence the lid of expiation, the propitiatory

1b) an expiatory sacrifice

1c) a expiatory victim

Part of Speech: noun neuter

Relation: from a derivative of G2433

Citing in TDNT: 3:318, 362

Usage:

This word is used 2 times:

 

Romans 3:25: "Whom God hath set forth to be a propitiation through faith in his"
Hebrews 9:5: "of glory shadowing the mercy seat; of which we cannot"