mustard

1. 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).
2. Powder or paste made from seeds of the mustard plant, and used as a condiment or a spice.

   When the waitress brought the food, I asked whether she had any Dijon mustard.

3. The leaves of the mustard plant, used as a salad.

   Mustard and cress sandwiches.

4. Dark yellow colour, the colour of mustard.
5. The tomalley of a crab, which resembles the condiment.

adjective

Of a dark yellow colour.