misoPronunciation: /ˈmiːsəʊ/Definition of miso noun [mass noun] paste made from fermented soya beans and barley or rice malt, used in Japanese cookery. (also miso soup) a soup thickened with miso paste, often with added tofu or vegetables: a bowl of piping hot misoOrigin:Japanesemiso in other Oxford dictionaries Definition of miso in the US English dictionary