ho (Greek #3588)
the definite article; the (sometimes to be supplied, at others omitted, in English idiom)
KJV usage: the, this, that, one, he, she, it, etc.
Pronounce: ho
Origin: ἡ (hay), and the neuter τό (to) in all their inflections
hilasterion (Greek #2435)
an expiatory (place or thing), i.e. (concretely) an atoning victim, or (specially) the lid of the Ark (in the Temple)
KJV usage: mercyseat, propitiation.
Pronounce: hil-as-tay'-ree-on
Origin: neuter of a derivative of 2433