IPA: //ˈmʌstərd//
KK: /ˈmʌstərd/
A type of condiment made from the seeds of certain plants, often used to add flavor to food.
I like to put mustard on my hot dog for extra flavor.
Mustard comes from the Old French 'mostarde' (meaning mustard), which itself derives from the Latin 'mustum' (meaning must, or unfermented grape juice) and 'ardens' (meaning burning). The word originally referred to the burning taste of the condiment made from the seeds of the mustard plant.
Think of the 'burning' sensation ('ardens') that mustard gives when you taste it, which connects to its name.