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hydrogen peroxide
hydrogen sulfate
hydrogen sulfide
hydrogen sulfite
hydrogen tartrate
hydrogenase
hydrogenate
hydrogenize
hydrogenolysis
hydrogenous
hydrogeology
hydrography
hydroid
hydrokinetics
hydrolase
hydrologic cycle
hydrology
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hydromedusa
hy·dro·me·du·sa [ hdrōm dssə, hdrōmi dy ssə ] (plural hy·dro·me·du·sae [ hdrōmə dssee, hdrōmə dzee ])


noun 
Definition:
 
reproductive stage of hydroid: a free-swimming invertebrate ocean animal, resembling a tiny jellyfish, that is the reproductive stage of a hydroid
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