iodine

Concise Oxford English Dictionary © 2008 Oxford University Press:
iodine /ˈʌɪədiːn, -ʌɪn, -ɪn/

▶noun the chemical element of atomic number 53, a halogen forming black crystals and a violet vapour. (Symbol: I)

■ an antiseptic solution of iodine in alcohol.

– derivatives
iodinate verb,
iodination noun,
iodize (or iodise) verb.

– origin C19: from Fr. iode (from Gk iōdēs ‘violet-coloured’) + -ine4.