Sin·al·bin n.  Chem. A glucoside found in the seeds of white mustard (Brassica alba, formerly Sinapis alba), and extracted as a white crystalline substance.

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 White mustard. A kind of mustard (Sinapis alba) with rough-hairy foliage, a long-beaked hispid pod, and pale seeds, which yield mustard and mustard oil. The plant is also grown for forage.

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 Sinapis alba
      n : Eurasian mustard cultivated for its pungent seeds; a source
          of table mustard and mustard oil [syn: white mustard, {Brassica
          hirta]