1. 碘
Iodine is a dark-coloured substance used in medicine and photography.

1. a tincture consisting of a solution of iodine in ethyl alcohol
applied topically to wounds as an antiseptic

Synonym: tincture of iodine

2. a nonmetallic element belonging to the halogens
used especially in medicine and photography and in dyes
occurs naturally only in combination in small quantities (as in sea water or rocks)

Synonym: iodinIatomic number 53