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hydrogen embrittlement
hydrogen fluoride
hydrogen iodide
hydrogen ion
hydrogen peroxide
hydrogen sulfate
hydrogen sulfide
hydrogen sulfite
hydrogen tartrate
hydrogenase
hydrogenate
hydrogenize
hydrogenolysis
hydrogenous
hydrogeology
hydrography
hydroid
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hydrogel
hy·dro·gel [ hdrə jèl ] (plural hy·dro·gels)


noun 
Definition:
 
substance like jelly: a thick fluid like a jelly, formed by the addition of a substance to water
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