'White mustard' definitions:

Definition of 'white mustard'

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

Definition of 'White mustard'

From: GCIDE
  • 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.]