[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

Collins English Dictionary - Complete & Unabridged 10th Edition
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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 for hydrogenated
Along with soybean oil, it is very often partially or fully hydrogenated.
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