D defs.my
Entry 2 senses Webster, 1913

Mustard

/mŭsʹ-tərd/ · Mus·tard · IPA /[ˈmas.təd]/
01 n. The name of several cruciferous plants of the genus Brassica (formerly Sinapis), as white mustard (Brassica alba), black mustard (Brassica …
  1. 1.
    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).(Bot.)
  2. 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.
Phrases & compounds
Mustard oil — 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.