The Collaborative International Dictionary of English v.0.48:

Sinalbin \Sin*al"bin\, n. [From L. Sinapis + alba.] (Chem.)
   A glucoside found in the seeds of white mustard (Brassica
   alba, formerly Sinapis alba), and extracted as a white
   crystalline substance.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

White mustard \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.
   [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

Sinapis alba
    n 1: Eurasian mustard cultivated for its pungent seeds; a source
         of table mustard and mustard oil [syn: white mustard,
         Brassica hirta, Sinapis alba]