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iodine

i·o·dine

iodine

pronunciation:
aI daIn [or] aI dihn
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part of speech: noun
definition 1: a highly reactive chemical element of the halogen group that has fifty-three protons in each nucleus and occurs naturally in compounds such as salts, and in pure form as a poisonous bluish black crystal. (symbol: I)
definition 2: a solution of powdered iodine together with sodium iodide or potassium iodide in alcohol, used as an antiseptic; tincture of iodine.
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  bacteria, element