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hydraulics
hydrazide
hydrazine
hydrazoic acid
hydric
hydride
hydrilla
hydriodic acid
hydro
hydro-
hydroacoustics
hydrobiology
hydroboration
hydrobromic acid
hydrocarbon
hydrocele
hydrocellulose
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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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