- a nonmetallic halogen element occurring at ordinary temperatures as a grayish-black crystalline solid that sublimes to a dense violet vapor when heated: used in medicine as an antiseptic. Symbol: I; atomic weight: 126.904; atomic number: 53; specific gravity: (solid) 4.93 at 20°C.
Origin of iodine
Examples from the Web for iodine
They said this phenomenon might have caused the level of iodine to rise before the tap water could reach the purifying plant.Radiation in Tokyo's Tap Water
March 23, 2011
At Chernobyl, iodine fell on the grass, cows ate the grass, and people drank the milk.
The iodine plume itself is not the issue, agreed Brenner, but that it falls on the grass and cows eat it.
Even at the Chernobyl meltdown in 1986, he pointed out, cesium and iodine were the problem.The Toxic Fuel Inside Japan's Nuclear Plant
March 15, 2011
One of the isotopes of fission products, when fuel melts, is an iodine isotope, and it goes in your body through your thyroid.Japan Nuclear Fallout: How Bad Could It Get?
March 12, 2011
Crystals of iodine as opposed to permanganate of potash for antiseptic he discussed.The Leopard Woman
Stewart Edward White
The doctors had vainly tried every remedy, iodine, blistering, and cauterising.The Three Cities Trilogy, Complete
The iodine will color the leaf dark where the cells contain starch.
You can tell what foods have starch in them by testing them with iodine.
The preparations of iodine have also been recommended, and they are very serviceable.Cattle and Their Diseases
- a bluish-black element of the halogen group that sublimates into a violet irritating gas. Its compounds are used in medicine and photography and in dyes. The radioisotope iodine-131 (radioiodine), with a half-life of 8 days, is used in the diagnosis and treatment of thyroid disease. Symbol: I; atomic no: 53; atomic wt: 126.90447; valency: 1, 3, 5, or 7; relative density: 4.93; melting pt: 113.5°C; boiling pt: 184.35°C
Word Origin and History for iodine
1814, formed by English chemist Sir Humphrey Davy (1778-1829) from French iode "iodine," coined 1812 by French chemist Joseph Louis Gay-Lussac from Greek ioeides "violet-colored," from ion "the violet; dark blue flower," + eidos "appearance" (see -oid). Davy added the chemical suffix -ine (2) to make it analogous with chlorine and fluorine. So called from the color of the vapor given off when the crystals are heated.
iodine(ī′ə-dīn′, -dĭn, -dēn′)
- A poisonous halogen element having compounds used as germicides, antiseptics, and food supplements, with numerous radioactive isotopes, which are used in diagnosis and treatment of thyroid diseases and neuroendocrine tumors. Atomic number 53.
- A liquid containing iodine dissolved in ethyl alcohol, used as an antiseptic for wounds.
- A shiny, grayish-black element of the halogen group. It is corrosive and poisonous and occurs in very small amounts in nature except for seaweed, in which it is abundant. Iodine compounds are used in medicine, antiseptics, and dyes. Atomic number 53; atomic weight 126.9045; melting point 113.5°C; boiling point 184.35°C; specific gravity (solid, at 20°C) 4.93; valence 1, 3, 5, 7. See Periodic Table.