An Etymological Dictionary of the German Language/Mostert

by Friedrich Kluge

Mostert, Mostrich, m. (the second word is a corruption of the first), ‘mustard,’ MidHG. mostert, musthart, m., ‘mustard mixed with must’; corresponding to the Rom. terms, Ital. mostarda, Fr. moutarde, whence MidE. and E. mustard, Du. mosterd. A derivative of Lat. mustum, ‘must,’ mustard being mixed with must. Comp. Senf.