iodine[ī′ō-dīn, -dēn]


1. A nonmetallic chemical element, atomic no. 53, atomic wt. 126.90447; used in the manufacture of iodine compounds and as a catalyst, reagent, tracer, constituent of radiographic contrast media, topical antiseptic, antidote for alkaloidal poisons, and in certain stains and solutions; formerly used for prophylaxis of iodine deficiency.

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