Source : Webster's Revised Unabridged Dictionary (1913)

Urticate \Ur"ti*cate\, v. t. & i. [imp. & p. p. {Urticated}; p.
   pr. & vb. n. {Urticating}.]
   To sting with, or as with, nettles; to irritate; to annoy.
   --G. A. Sala.

Source : WordNet®

urticate
     v 1: whip with or as with nettles
     2: sting with or as with nettles and cause a stinging pain or
        sensation [syn: {nettle}]