Plural: misflavours (UK) / misflavors (US)
Wrong or undesirably altered taste or smell of something, especially food; unpleasant aftertaste; unexpected or unmatching savour.
We should better not go into mentioning the hideous so-called refrigerator misflavour of over-aged long-frozen food. Our guests and we undoubtedly deserve a yummier and health-friendly treat. (Source: J∙ Okram - Mayonnaise Stew ● Cooking Recipe.)