sop (psomion): A thin, wafer-like piece of bread dipped into the common dish as a sort of improvised spoon, is thus designated in Jn 13:26 ff. See MORSEL.
Bibliography Information Orr, James, M.A., D.D. General Editor. "Definition for 'SOP'". "International Standard Bible Encyclopedia". bible-history.com - ISBE; 1915.