hypoiodous acid
A weak acid with the formula HIO, used in chemistry contexts.
Hypoiodous acid is one of the oxoacids of iodine.
Hypochlorous acid (HClO), a more commonly encountered weak acid used as a disinfectant.
Compound of 次亜 (hypo-) + ヨウ素 (iodine) + 酸 (acid), following standard chemical nomenclature.