1
: a nonmetallic halogen element with atomic number 53 that is an essential nutrient in the human diet and is used especially in medicine, photography, and analytical chemistry
—often used before another noun
iodine deficiency
iodine levels
iodine supplements
see Chemical Elements Table
2
: a tincture of iodine used especially as a topical antiseptic
The formerly popular antiseptic known as iodine is a tincture—a solution of iodine in alcohol.—Regina and Douglas Haggo
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Merriam-Webster unabridged
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