Hydrogenide :: Hydrogenide (n.) A binary compound containing hydrogen; a hydride. [R.] See Hydride.
Hydrogenium :: Hydrogenium (n.) Hydrogen; -- called also in view of its supposed metallic nature.
Hydrogenize :: Hydrogenize (v. t.) To combine with hydrogen; to treat with, or subject to the action of, hydrogen; to reduce; -- contrasted with oxidize..