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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Mus·tard n.
 1. Bot. The name of several cruciferous plants of the genus Brassica (formerly Sinapis), as white mustard (Brassica alba), black mustard (Brassica Nigra), wild mustard or charlock (Brassica Sinapistrum).
 Note:There are also many herbs of the same family which are called mustard, and have more or less of the flavor of the true mustard; as, bowyer's mustard (Lepidium ruderale); hedge mustard (Sisymbrium officinale); Mithridate mustard (Thlaspi arvense); tower mustard (Arabis perfoliata); treacle mustard (Erysimum cheiranthoides).
 2. A powder or a paste made from the seeds of black or white mustard, used as a condiment and a rubefacient.  Taken internally it is stimulant and diuretic, and in large doses is emetic.
 Mustard oil Chem., a substance obtained from mustard, as a transparent, volatile and intensely pungent oil.  The name is also extended to a number of analogous compounds produced either naturally or artificially.
 

From: WordNet (r) 2.0

 wild mustard
      n : weedy Eurasian plant often a pest in grain fields [syn: field
          mustard, charlock, chadlock, Brassica kaber, Sinapis
          arvensis]