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black mustard

n 1  :  a much-branched annual Eurasian herb (Brassica nigra) with small bright yellow flowers that is now widespread as a weed and is the principal source of table mustard  2  :  the dried ripe seed of black mustard or a relative (Brassica juncea) that was formerly much used in medicine as a rubefacient and emetic .
 
 

 
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