Mustard is the yellow sauce people commonly use to spice up their hotdogs. Whether it's ballpark mustard or fancy Grey Poupon, it's a condiment made from the ground seeds of the mustard plant.

Mustard comes in several different forms, including the bright yellow kind in a packet at your favorite fast food restaurant and the brownish, slightly coarse mustard that comes in a fancy jar labeled "Dijon." All of these mustards are made from mustard seeds and spices, often mixed with lemon juice and salt. The plant that grows these seeds also produces edible leaves called "mustard greens."

Definitions of mustard
  1. noun
    pungent powder or paste prepared from ground mustard seeds
    synonyms: table mustard
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    dry mustard, powdered mustard
    a substance such that one to three tablespoons dissolved in a glass of warm water is a homemade emetic
    Chinese mustard
    very hot prepared mustard
    type of:
    a preparation (a sauce or relish or spice) to enhance flavor or enjoyment
  2. noun
    any of several cruciferous plants of the genus Brassica
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    Brassica juncea, chinese mustard, gai choi, indian mustard, leaf mustard
    Asiatic mustard used as a potherb
    Brassica nigra, black mustard
    widespread Eurasian annual plant cultivated for its pungent seeds; a principal source of table mustard
    Brassica napus, colza, rape
    Eurasian plant cultivated for its seed and as a forage crop
    Brassica hirta, Sinapis alba, white mustard
    Eurasian mustard cultivated for its pungent seeds; a source of table mustard and mustard oil
    Brassica kaber, Sinapis arvensis, chadlock, charlock, field mustard, wild mustard
    weedy Eurasian plant often a pest in grain fields
    type of:
    crucifer, cruciferous plant
    any of various plants of the family Cruciferae
  3. noun
    leaves eaten as cooked greens
    synonyms: Indian mustard, leaf mustard, mustard greens
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    type of:
    cruciferous vegetable
    a vegetable of the mustard family: especially mustard greens; various cabbages; broccoli; cauliflower; brussels sprouts
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