| hydrate | (verb) cause to be hydrated; add water or moisture to | - |
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| (verb) become hydrated and combine with water | - |
| (verb) supply water or liquid to in order to maintain a healthy balance | - |
| hydrogenate | (verb) combine or treat with or expose to hydrogen; add hydrogen to the molecule of (an unsaturated organic compound) | - |
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| hydrolise | (verb) make a compound react with water and undergo hydrolysis | Synonyms: hydrolize |
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| hydrolize | (verb) make a compound react with water and undergo hydrolysis | Synonyms: hydrolise |
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| hydrolyse | (verb) undergo hydrolysis; decompose by reacting with water | Synonyms: hydrolyze |
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| hydrolyze | (verb) undergo hydrolysis; decompose by reacting with water | Synonyms: hydrolyse |
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| hydroplane | (verb) glide on the water in a hydroplane | Synonyms: seaplane |
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