iodine

io·dine

noun, often attrib \ˈī-ə-ˌdīn, -əd-^ən, -ə-ˌdēn\

Definition of IODINE

1

: a nonmetallic halogen element obtained usually as heavy shining blackish gray crystals and used especially in medicine (as in antisepsis and in the treatment of goiter and cretinism) and in photography and chemical analysis—symbol I; see element table

2

: a tincture of iodine used especially as a topical antiseptic