Word Study
    perchloric
CIDE DICTIONARY
perchloric, a. [Pref. per- + chloric.]. 
                                            
                                         Pertaining to, or designating, the highest oxygen acid (HClO4 ), of chlorine; -- called also hyperchloric .                                                                                 [1913 Webster]                                                                                                                    
                                                                                    
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