iodine

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iodine (I-ŏ-din) n. an element required in small amounts for healthy growth and development. The thyroid gland requires iodine to synthesize thyroid hormones; a deficiency of the element leads to goitre. povidone-i. an iodine-containing antiseptic and skin disinfectant. radioactive i. the radioactive isotope iodine-131, which is administered as a drink to shrink the thyroid gland in the treatment of hyperthyroidism. Symbol: I. See also Lugol's solution.

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