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Search Result for "hydrogenation": 
Wordnet 3.0

NOUN (1)

1. a chemical process that adds hydrogen atoms to an unsaturated oil;
- Example: "food producers use hydrogenation to keep fat from becoming rancid"

The Collaborative International Dictionary of English v.0.48:

Hydrogenation \Hy`dro*gen*a"tion\, n. (Chem.) The act of combining with hydrogen, or the state of being so combined. [1913 Webster]