The Collaborative International Dictionary
Iod-
Iodo- \I"o*do-\, Iod- \I"od-\ (Chem.) A prefix, or combining from, indicating iodine as an ingredient; as, iodoform.
Iod-
Iod- \I"od-\ (Chem.) See Iodo-.
Wiktionary
iod-
pre. (context chemistry English) (alternative form of iodo- nodot=1 English); used mainly before a vowel.