The Collaborative International Dictionary of English v.0.48:

Extirpate \Ex"tir*pate\ (?; 277), v. t. [imp. & p. p.
   Extirpated; p. pr. & vb. n. Extirpating.] [L. extirpatus,
   exstirpatus, p. p. of extirpare, exstirpare; ex out + strips
   stock, stem, root.]
   To pluck up by the stem or root; to root out; to eradicate,
   literally or figuratively; to destroy wholly; as, to
   extirpate weeds; to extirpate a tumor; to extirpate a sect;
   to extirpate error or heresy.

   Syn: To eradicate; root out; destroy; exterminate;
        annihilate; extinguish.
        [1913 Webster]