Entry 1 sense Webster, 1913 Iodous · I·o·dous · IPA 01 a. Pertaining to, or containing, iodine. See -ous (chemical suffix). 1. Pertaining to, or containing, iodine. See -ous (chemical suffix).(Chem.) See: -ous Phrases & compounds Iodous acid — a hypothetical acid, analogous to chlorous acid.