Source : Webster's Revised Unabridged Dictionary (1913)

Ionize \I"on*ize\, v. t. [imp. & p. p. {Ionized}; p. pr. & vb.
   n. {Ionizing}.] (Elec. Chem.)
   To separate (a compound) into ions, esp. by dissolving in
   water. -- {I`on*i*za"tion}, n.

Source : WordNet®

ionize
     v 1: become converted into ions [syn: {ionise}]
     2: convert into ions [syn: {ionise}]