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hydrofluoric acid
hydrofoil
hydroforming
hydrogasification
hydrogel
hydrogen
hydrogen bomb
hydrogen bond
hydrogen bromide
hydrogen carbonate
hydrogen chloride
hydrogen cyanide
hydrogen embrittlement
hydrogen fluoride
hydrogen iodide
hydrogen ion
hydrogen peroxide
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hydrocoral
hy·dro·cor·al [ hdrə káwrəl ] (plural hy·dro·cor·als)


noun 
Definition:
 
marine organism: a multicellular organism that lives in the ocean in colonies and builds calcareous skeletons within which the animals live. Order Milleporina, Stylasterina.
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