'hydrogenic' is formed from the noun 'hydrogen' plus the adjective-forming suffix '-ic'. 'Hydrogen' comes from Modern Latin/Greek roots where 'hydro-' meant 'water' and 'genes' meant 'born' or 'producing'.

'hydrogen' was coined in late 18th-century chemistry (French 'hydrogène', attributed to Antoine Lavoisier and others) from Greek elements 'hydro-' + 'genes'; adding the English/Latin-derived suffix '-ic' produced 'hydrogenic' in modern scientific English.

Originally the root referred to 'water-forming' (i.e., the element that produces water when burned), and over time derivatives like 'hydrogenic' came to mean 'related to or produced by hydrogen' in chemical contexts.