Source : Webster's Revised Unabridged Dictionary (1913)

Hydrogenate \Hy"dro*gen*ate\, v. t. [imp. & p. p.
   {Hydrogenated}; p. pr. & vb. n. {Hydrogenating}.] (Chem.)
   To hydrogenize.

Source : WordNet®

hydrogenate
     v : combine or treat with or expose to hydrogen, especially to
         add hydrogen to the molecule of (an unsaturated organic
         compound) [ant: {dehydrogenate}]