The Collaborative International Dictionary
Hydrogenous
Hydrogenous \Hy*drog"e*nous\, a. Of or pertaining to hydrogen; containing hydrogen.
Wiktionary
hydrogenous
a. of, related to, or containing hydrogen
Usage examples of "hydrogenous".
Nine are massive gas giants, five possess hydrogenous or methane atmospheres, while the remaining five lack volatiles and an atmosphere of any kind.