iodine
Pronunciation: /ˈʌɪədiːn, -ʌɪn, -ɪn/
noun
- the chemical element of atomic number 53, a non-metallic element forming black crystals and a violet vapour. (Symbol: I)
- a solution of iodine in alcohol, used as a mild antiseptic.
- 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