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Definition of mustard
1a pungent-tasting yellow or brown paste made from the crushed seeds of certain plants, typically eaten with meat or used as a cooking ingredient. 2the yellow-flowered Eurasian plant of the cabbage family whose seeds are used to make this paste.
- Genera Brassica and Sinapis, family Brassicaceae: several species, in particular black mustard (B. nigra) and white mustard (S. alba)
used in names of related plants, only some of which are used to produce mustard for the table, e.g., hedge mustard.