Dictionary![]() ![]() hy•dro•gen•atePronunciation: (hī'dru-ju-nāt", hī-droj'u-), [key] —v.t., -at•ed, -at•ing. to combine or treat with hydrogen, esp. to add hydrogen to the molecule of (an unsaturated organic compound). Also,hydrogenize. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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