Meaning

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

originFrom Middle English mustard, from Old French moustarde (French moutarde), from moust (“must”), from Latin mustum. Compare Saterland Frisian Muster (“mustard”), Dutch mosterd (“mustard”), German Low German Musterd (“mustard”), Icelandic mustarður (“mustard”). Displaced Middle English senep, from Old English senep, from Latin sināpi (“mustard”). Sometimes mistakenly thought to come from Latin…

Etymology from Wiktionary, CC BY-SA 3.0