The Collaborative International Dictionary
Iodous acid
Iodous \I"o*dous\, a. (Chem.) Pertaining to, or containing, iodine. See -ous (chemical suffix).
Iodous acid, a hypothetical acid, analogous to chlorous acid.
Wiktionary
iodous acid
n. (context chemistry English) The hypothetical acid HIO2 analogous to chlorous acid
Wikipedia
Iodous acid
Iodous acid is the chemical compound with the formula HIO. Its salts are named iodites; these are exceedingly unstable and have been observed but never isolated.