[hahy-druh-juh-neyt, hahy-droj-uh-]
verb (used with object), hydrogenated, hydrogenating.
to combine or treat with hydrogen, especially to add hydrogen to the molecule of (an unsaturated organic compound).

1800–10; hydrogen + -ate1

hydrogenation, noun
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World English Dictionary
hydrogenate, hydrogenize or hydrogenise (ˈhaɪdrədʒɪˌneɪt, haɪˈdrɒdʒɪˌneɪt)
to undergo or cause to undergo a reaction with hydrogen: to hydrogenate ethylene
hydrogenize, hydrogenize or hydrogenise
hydrogenise, hydrogenize or hydrogenise
hydrogen'ation, hydrogenize or hydrogenise
hydrogeni'zation, hydrogenize or hydrogenise
hydrogeni'sation, hydrogenize or hydrogenise
'hydrogenator, hydrogenize or hydrogenise

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American Heritage
Medical Dictionary

hydrogenation hy·dro·gen·a·tion (hī'drə-jə-nā'shən, hī-drŏj'ə-)
The addition of hydrogen to a compound, especially to solidify an unsaturated fat or fatty acid.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
hydrogenate   (hī'drə-jə-nāt', hī-drŏj'ə-nāt')  Pronunciation Key 
  1. To treat or combine chemically an unsaturated compound with hydrogen. Liquid vegetable oils are often hydrogenated to turn them into solids.

  2. To turn coal into oil by combining its carbon with hydrogen to form hydrocarbons.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Trans fatty acids are unhealthy fats that form when vegetable oil hardens in a process called hydrogenation.
Trans fats are created by pumping hydrogen into liquid oil at high temperature, a process called partial hydrogenation.
One goal of this project is to optimize the balance between hydrogen consumption and product value for hydrogenation processes.
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