Brown-Driver-Briggs (BDB)
H3727
H3727 כַּפֹּרֶת propitiatory , late techn. word cover over sin : the older explan. cover , lid has no justification in usage
Brown-Driver-Briggs Hebrew Lexicon (BDB), 1906 — public domain
Strong's H3727 · Hebrew
kapporeth
kap-po'-reth
from 3722; a lid (used only of the cover of the sacred Ark)