Webster's Online Dictionary
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Definition: HYPERCHLORIC

Part of Speech Definition
Adjective 1. An alternative spelling for "Perchloric": Pertaining to, or designating, the highest oxygen acid (HClO4), of chlorine; -- called also hyperchloric.[Websters].

Source: Webster's Revised Unabridged Dictionary (1913)

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Date "Hyperchloric" was first used in popular English literature: sometime before 1914. (references)

Definition: HYPERCHLORIC

Part of SpeechDefinition
Adjective1. An alternative spelling for "Perchloric": Pertaining to, or designating, the highest oxygen acid (HClO4), of chlorine; -- called also hyperchloric.[Websters].

Source: Webster's Revised Unabridged Dictionary (1913)

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Date "HYPERCHLORIC" was first used in popular English literature: sometime before 1914. (references)