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hydroxyproline
hydrozoan
Hydrus
hyena
hyetal
hyeto-
hyetograph
Hygeia
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hygienic
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hydroxide ion
hy·drox·ide i·on (plural hy·drox·ide i·ons)


noun 
Definition:
 
chemistry 
Same as  hydroxyl
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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