tu·ber·ous /ˈtub(ə)rəs, ˈtju-/
  (a.)有塊莖的,塊莖狀的,有結節的
  tu·ber·ous /ˈt(j)ub(ə)rəs/ 形容詞
  Tu·ber·ous a.
  1. Covered with knobby or wartlike prominences; knobbed.
  2. Bot. Consisting of, or bearing, tubers; resembling a tuber.
  -- Tu*ber*ous*ness, n.
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  tuberous
       adj : of or relating to or resembling a tuber; "a tuberous root"