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Related to periodic acid: Periodic acid Schiff
per·i·od·ic ac·id(pēr'ē-ō'dik as'id),
1. HIO4, but existing in solution, usually in hydrated form; used in carbohydrate detection and analysis. Synonym(s): metaperiodic acid
2. Any of several iodic(VII) acids formed by the combination of iodine heptoxide, I2O7, with water.