Source : Webster's Revised Unabridged Dictionary (1913)

Tuberous \Tu"ber*ous\, a. [L. tuberosus: cf. F. tub['e]reux. See
   {Tuber}, and cf. also {Tuberose}.]
   1. Covered with knobby or wartlike prominences; knobbed.

   2. (Bot.) Consisting of, or bearing, tubers; resembling a
      tuber. -- {Tu"ber*ous*ness}, n.

Source : WordNet®

tuberous
     adj : of or relating to or resembling a tuber; "a tuberous root"