noun. any plant of the genus Nigella.
1. Noun, singular or mass One thing to consider is the fact that oregano is a plant, which means that it will not have the same texture as the nigella seed. 2. Adjective If you've ever had a flatbread with black seeds sprinkled on it, those were probably nigella. 3. Determiner Cumin seeds are a good substitute because they have a peppery and nutty flavor that is similar to nigella seeds.