What is "hydrogenize"

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.

alt. (context transitive chemistry dated English) to hydrogenate vb. (context transitive chemistry dated English) to hydrogenate