Source : Webster's Revised Unabridged Dictionary (1913)

Hydrogenize \Hy"dro*gen*ize\, v. t. [imp. & p. p.
   {Hydrogenized}; p. pr. & vb. n. {Hydrogenizing}.] (Chem.)
   To combine with hydrogen; to treat with, or subject to the
   action of, hydrogen; to reduce; -- contrasted with oxidize.