zyma

zyma [ζύμη], fermenting agent added to dough to make it rise, leaven (also fig.); b (~a vetus, w. ref. to I Cor. v 7). modo tedet veri lima / ‥ modo zima / placet adulancium Walt. Wimb. Van. 117; zimum vel zemis, i. fermentum, extenuatorium est et mediocriter calefacit Alph. 198; sowre daghe, fermentum, zima CathA.  b a zima veteri mundentur animi / baptissimo [sic MS] fletuum, ut simus azimi Walt. Wimb. Sim. 204; aldesynne, zima vetus, vetus peccatum CathA.