Learn how to say Hydrogenous correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word hydrogen:
a colourless, odourless, highly flammable gas, the chemical element of atomic number 1. (Symbol: H)
Hydrogen is the lightest of the chemical elements and has the simplest atomic structure, a single electron orbiting a nucleus consisting of a single proton. It is by far the commonest element in the universe, although not on the earth, where it occurs chiefly combined with oxygen as water
late 18th century: coined in French from Greek hudro- ‘water’ + -genēs (see -gen)