iodin

iodine

[ahy-uh-dahyn, -din; in Chemistry also ahy-uh-deen]
noun Chemistry.
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.
Also, iodin [ahy-uh-din] .


Origin:
1814; < French iode (< Greek īṓdēs, orig. rust-colored, but by folk etymology taken as í(on) violet + -ōdēs -ode1) + -ine2; introduced by H. Davy

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World English Dictionary
iodine (ˈaɪəˌdiːn)
 
n
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
 
[C19: from French iode, from Greek iōdēs rust-coloured, but taken to mean violet-coloured, through a mistaken derivation from ion violet]

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Etymonline
Word Origin & History

iodine
1814, formed by British chemist Sir Humphry Davy from Fr. iode "iodine," coined 1812 by Fr. chemist Joseph Louis Gay-Lussac from Gk. ioeides "violet-colored," from ion "violet" + eidos "appearance" (see -oid). So called from the color of the vapor given off when the crystals are heated.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

iodine i·o·dine (ī'ə-dīn', -dĭn, -dēn')
n.


  1. Symbol I A poisonous halogen element having compounds used as germicides, antiseptics, and food supplements, with radioactive isotopes, especially I 131, used in thyroid disease diagnosis and therapy. Atomic number 53; atomic weight 126.9045; melting point 113.7°C; boiling point 184.4°C; specific gravity (solid, at 20°C) 4.93; valence 1, 3, 5, 7.

  2. A liquid containing iodine dissolved in ethyl alcohol, used as an antiseptic for wounds.

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American Heritage
Science Dictionary
iodine   (ī'ə-dīn')  Pronunciation Key 
Symbol I
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.
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