Main Entry: hy·dro·gen

Pronunciation: \ˈhī-drə-jən\

Function: noun

: a nonmetallic element that is the simplest and lightest of the elements and that is normally a colorless odorless highly flammable diatomic gas—symbol H; see deuterium, tritium; element table

—hy·drog·e·nous \hī-ˈdräj-ə-nəs\ adjective