v. (transitive) to treat something, or react something, with hydrogen; especially to react an unsaturated fat with hydrogen, in the presence of a nickel catalyst, to produce a harder saturated fat
the GNU version of the Collaborative International Dictionary of English
v. To hydrogenize.
The Century Dictionary and Cyclopedia
To cause to combine with hydrogen; hydrogenize.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
v. combine or treat with or expose to hydrogen; add hydrogen to the molecule of (an unsaturated organic compound)
Word Usage
"I won't bore you with the chemistry, but the trans forms of fats are lower in energy and are thermodynamically favored when and if the fat molecules rearrange, so it is a challenge to hydrogenate oils without having them do this."