1) Antidoron 2) Byzantine Rite 
A prosphoron (πρόσφορον, offering) is a small loaf of leavened bread used in Orthodox Christian and Greek Catholic (Byzantine) liturgies. The plural form is prosphora (πρόσφορα). The term originally meant any offering made to a temple, but in Orthodox Christianity it has come to mean specifically the bread offered at the Divine Li...
antidoron.