Source : Webster's Revised Unabridged Dictionary (1913)

Eradicate \E*rad"i*cate\, v. t. [imp. & p. p. {Eradicated}; p.
   pr. & vb. n. {Eradicating}.] [L. eradicatus, p. p. of
   eradicare to eradicate; e out + radix, radicis, root. See
   {Radical}.]
   1. To pluck up by the roots; to root up; as, an oak tree
      eradicated.

   2. To root out; to destroy utterly; to extirpate; as, to
      eradicate diseases, or errors.

            This, although now an old an inveterate evil, might
            be eradicated by vigorous treatment.  --Southey.

   Syn: To extirpate; root out; exterminate; destroy;
        annihilate.

Source : WordNet®

eradicate
     v 1: kill in large numbers; "the plague wiped out an entire
          population" [syn: {eliminate}, {annihilate}, {extinguish},
           {wipe out}, {decimate}, {carry off}]
     2: destroy completely, as if down to the roots; "the vestiges
        of political democracy were soon uprooted" [syn: {uproot},
         {extirpate}, {exterminate}]