[mee-soh; Japn. mee-saw] 
| a fermented seasoning paste of soybeans, often with rice or barley added, used to flavor soups and sauces. |
| mi·so (mē'sō) n. pl. mi·sos A thick fermented paste made of cooked soybeans, salt, and often rice or barley, and used especially in making soups and sauces. [Japanese.] |