Source : Webster's Revised Unabridged Dictionary (1913)

Mangel-wurzel \Man"gel-wur`zel\, n. [G., corrupted fr.
   mangoldwurzel; mangold beet + wurzel root.] (Bot.)
   A kind of large field beet ({B. macrorhiza}), used as food
   for cattle, -- by some considered a mere variety of the
   ordinary beet. See {Beet}. [Written also {mangold-wurzel}.]

Source : WordNet®

mangel-wurzel
     n 1: beet with a large yellowish root; grown chiefly as cattle
          feed [syn: {mangold-wurzel}, {mangold}, {Beta vulgaris
          vulgaris}]
     2: cultivated as feed for livestock