iodine
Pronunciation: /ˈʌɪədiːn, -ʌɪn, -ɪn/
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Definition of iodine
noun
A member of the halogen group, iodine occurs chiefly as salts in seawater and brines. As a constituent of thyroid hormones it is required in small amounts in the body, and deficiency can lead to goitre
Origin:
early 19th century: from French iode (from Greek iōdēs 'violet-coloured', from ion 'violet' + -eidēs 'like') + -ine4
