WordReference Random House Unabridged Dictionary of American English © 2026
per′i•od′ic ac′id
(pûr′ī od′ik, pûr′-),USA pronunciation [Chem.]
- Chemistryany of a series of acids derived from I2O7 by the addition of water molecules, as HIO4 or H5IO6.
- 1830–40
'periodic acid' also found in these entries (note: many are not synonyms or translations):