Imperfection or bodily deformity excluding men from the priesthood, and rendering animals unfit to be offered in sacrifice (Leviticus 21:17-23; 22:19-25). The Christian church, as justified in Christ, is "without blemish" (Ephesians 5:27). Christ offered himself a sacrifice "without blemish," acceptable to God (1 Peter 1:19).
These dictionary topics are from M.G. Easton M.A., D.D., Illustrated Bible Dictionary, Third Edition, published by Thomas Nelson, 1897. Public Domain, copy freely.
Easton, Matthew George. "Entry for 'Blemish'". "Easton's Bible Dictionary".