iodine

6 ENTRIES FOUND:

io·dine

noun, often attributive \ˈī-ə-ˌdīn, -dən, -ˌdēn\

: a chemical element that is used especially in medicine and photography

Full Definition of IODINE

1
:  a nonmetallic halogen element obtained usually as heavy shining blackish-gray crystals and used especially in medicine, photography, and analysis — see element table
2
:  a tincture of iodine used especially as a topical antiseptic

Origin of IODINE

French iode, from Greek ioeidēs violet colored, from ion violet
First Known Use: 1814

io·dine

noun , often attrib \ˈī-ə-ˌdīn, -əd-ən, -ə-ˌdēn\   (Medical Dictionary)

Medical 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

iodine

noun    (Concise Encyclopedia)

Nonmetallic chemical element, chemical symbol I, atomic number 53. The heaviest nonradioactive halogen, it is a nearly black crystalline solid (diatomic molecule I) that sublimes (see sublimation) to a deep violet, irritating vapour. It is never found in nature uncombined. Its sources (mostly in brines and seaweeds) and compounds are usually iodides; iodates (small amounts in saltpeter) and periodates also occur. Dietary iodine is essential for thyroid gland function; in areas of the world where food contains insufficient iodine, an iodine compound such as potassium iodide (KI) is added to table salt (sodium chloride) to prevent iodine deficiency. Elemental iodine is used in medicine, in synthesizing some organic chemicals, in manufacturing dyes, in analytical chemistry (see analysis) to measure fat saturation (see hydrogenation) and to detect starch, and in photography. The radioactive isotope iodine-131 (see radioactivity), with an eight-day half-life, is very useful in medicine (see nuclear medicine) and other applications.

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