mustard

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of various Eurasian plants of the mustard family, especially white mustard, Indian mustard, and black mustard, which are cultivated for their pungent seeds and edible leaves.
• noun A condiment made from the powdered seeds of certain of these plants.
• noun A member of the mustard family.
• noun A dark yellow to light olive brown.
• noun Any of a group of toxic organic compounds that include mustard gas and the nitrogen mustards.

from The Century Dictionary.

• noun A plant of the genus Brassica, formerly classed as Sinapis.
• noun The seed of mustard crushed and sifted (and often adulterated), used in the form of a paste as a condiment. or, in the form of a poultice (sinapism), plaster, or prepared paper (mustard-paper), as a rubefacient.
• noun One of numerous mustard-like plants, almost all cruciferous: used with a qualifying word. See names below
• noun Clypeola Jonthlaspi.
• noun Sometimes, erroneously, the pennycress

from the GNU version of the Collaborative International Dictionary of English.

• noun (Bot.) The name of several cruciferous plants of the genus Brassica (formerly Sinapis), as white mustard (Brassica alba), black mustard (Brassica Nigra), wild mustard or charlock (Brassica Sinapistrum).
• noun A powder or a paste made from the seeds of black or white mustard, used as a condiment and a rubefacient. Taken internally it is stimulant and diuretic, and in large doses is emetic.
• noun (Chem.) a substance obtained from mustard, as a transparent, volatile and intensely pungent oil. The name is also extended to a number of analogous compounds produced either naturally or artificially.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun 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.
• noun Powder or paste made from seeds of the mustard plant, and used as a condiment or a spice.
• noun Dark yellow colour, the colour of mustard.
• noun The tomalley of a crab, which resembles the condiment.
• adjective of a dark yellow colour.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun any of several cruciferous plants of the genus Brassica
• noun pungent powder or paste prepared from ground mustard seeds
• noun leaves eaten as cooked greens