man·gel-wur·zel 
(mănggəl-wûr′zəl)
(mănggəl-wûr′zəl)n.
A variety of the common beet having a large yellowish root, used chiefly as cattle feed.
[German Mangelwurzel, alteration (influenced by Mangel, scarcity) of Mangoldwurzel : Mangold, beet (from Middle High German mānegolt) + Wurzel, root; see wrād- in the Appendix of Indo-European roots.]