Webster's English Dictionary

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mustard

mus.tard \'m*s-t*rd\ n [ME, fr. OF mostarde, fr. moust must, fr. L mustum] 
   often attrib  1a: a pungent yellow powder of the seeds of a common mustard 
   used as a cond iment or in medicine as a stimulant and diuretic, an emetic, 
   or a counterirritant slang  1b: ZEST  2: any of several herbs (genus 
   Brassica of the family Cruciferae, the  mustard family) with lyrately lobed 
   leaves, yellow flowers, and linear beaked pods 3a: MUSTARD GAS  3b: 
   NITROGEN MUSTARD