hydrogen-1 n.
The most abundant isotope of hydrogen, having atomic mass 1. Also called protium.


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  • Hydrogen-2

    hydrogen-2 n. See deuterium.

  • Hydrogen-3

    hydrogen-3 n. See tritium.

  • Hydrogenase

    hydrogenase hy·drog·e·nase (hī-drŏj’ə-nās’, -nāz’) n. An enzyme in certain microorganisms that catalyzes the formation of hydrogen.

  • Hydrogenate

    [hahy-druh-juh-neyt, hahy-droj-uh-] /ˈhaɪ drə dʒəˌneɪt, haɪˈdrɒdʒ ə-/ verb (used with object), hydrogenated, hydrogenating. 1. to combine or treat with , especially to add to the molecule of (an unsaturated organic compound). /ˈhaɪdrədʒɪˌneɪt; haɪˈdrɒdʒɪˌneɪt/ verb 1. to undergo or cause to undergo a reaction with hydrogen: to hydrogenate ethylene v. 1809, from hydrogen + -ate (2). […]

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