[Middle English croser, from Old French crossier, staff bearer (influenced by croisier, one who bears a cross), from crosse, crosier, of Germanic origin.]
1290, from O.Fr. crocier, from M.L. crociarius "bearer of a cross," from crocia "cross;" also from O.Fr. croisier "one who bears or has to do with a cross." The two words merged in M.E. Technically, "the bearer of a bishop's pastoral staff;" erroneously applied to the staff itself since 1733.