Similar words: hydrogen, hydrogen bomb, hydrogen bond, nitrogen fixation, hydration, dehydration, alternation of generations, androgen. Meaning: [‚haɪdrədʒɪ'neɪʃn] 
n. a chemical process that adds hydrogen atoms to an unsaturated oil.
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More similar words: hydrogen, hydrogen bomb, hydrogen bond, nitrogen fixation, hydration, dehydration, alternation of generations, androgen, water of hydration, alienation, chondrogenesis, rejuvenation, homogenization, concatenation, denaturalization, hydro, international relations, nationalization, nationalisation, transnational corporation, multinational corporation, United Nations Organization, hydrofoil, hydrocele, hydrology, hydroxide, anhydrous, hydrolase, hydrothermal, hydroponic.