mustard

mus·tard

noun \ˈməs-tərd\

Definition of MUSTARD

1

: a pungent yellow condiment consisting of the pulverized seeds of the black mustard or sometimes the white mustard either dry or made into a paste and serving as a stimulant and diuretic or in large doses as an emetic and as a counterirritant when applied to the skin as a poultice

2

: any of several herbs (genus Brassica of the family Cruciferae, the mustard family) with lobed leaves, yellow flowers, and linear beaked pods—see black mustard 1, white mustard

3

a : mustard gas b : nitrogen mustard