Definition of periodic acid in US English:

periodic acid


  • A hygroscopic solid acid with strong oxidizing properties.

    Chemical formula: H₅IO₆

    • ‘Semi-thin sections were incubated first with periodic acid for 8 min, rinsed in distilled water and then treated in the dark with Schiff reagent for 15 min to reveal carbohydrates.’
    • ‘We also note that atherinomorphs have periodic acid Schiff-positive yolk, but the phylogenetic significance of this observation remains to be determined with further surveys.’


Mid 19th century: from per- (sense 2)+ iodic acid.


periodic acid

/ˌpərīˌädik ˈasəd/