Mustard is a spicy yellow or brown sauce or paste made from the seeds of the mustard plant, used as a condiment on foods like sandwiches and hot dogs. The word can also refer to the plant itself.
From Old French *mostarde*, from *most* “new wine, must” + *ardent* “burning,” because mustard seeds were originally mixed with grape must to make a hot sauce. The Latin root *mustum* gave us *must* in winemaking and influenced this word.
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