any of several cruciferous plants of the genus Brassica
"The farmers harvested mustard to use as a green vegetable in their salad mix."
pungent powder or paste prepared from ground mustard seeds
"She sprinkled a little yellow, pungent mustard over her grilled chicken to add some zing."
leaves eaten as cooked greens
"After harvesting the mustard plants, she washed and sautéed the tender green leaves to serve as a side dish."
A plant of certain species of the genus Brassica, or of related genera (especially Sinapis alba, in the family Brassicaceae, with yellow flowers, and linear seed pods).
"The gardener carefully harvested the ripe mustard plants from their field to dry their seeds for oil."
In plain English: Mustard is a yellow condiment made from ground seeds that people often put on food to add flavor.
"He added some mustard to his sandwich."
Usage: Mustard refers to both the pungent condiment made from ground seeds and the mustard greens themselves. When using this word for the plant species specifically, it usually appears in botanical contexts rather than everyday cooking or dining situations.
Of a dark yellow colour.
"The old taxi was painted in a faded mustard shade that stood out against the grey pavement."
A surname.
"The local historian wrote about the famous politician named Mustard who served in the early twentieth century."
The word mustard comes from the Old French moustarde, which originally referred to "must," or unfermented grape juice. This term was borrowed from the Latin mustum and eventually replaced the earlier Middle English word senep.