noun
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the plant Brassica juncea of Brassicaceae family; mustard plant.
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its small, black seed used as a spice; mustard.
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oil extracted from mustard seeds.
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a kind of vegetable curry made using this oil.
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a very minute unit of weight, equal to the weight of one mustard seed.
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a very small unit of linear measure equal to the diametre of a mustard seed.