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American Heritage Dictionary - Cite This Source - Share This

i·o·dine       (ī'ə-dīn', -dĭn, -dēn')  Pronunciation Key  n.   Symbol I2 A lustrous, grayish-black, corrosive, poisonous halogen element having radioactive isotopes, especially I 131, used as a medical tracer and in thyroid disease diagnosis and therapy. Iodine compounds are used as germicides, 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 Table at element. An antiseptic preparation containing iodine in solution, used to treat wounds. [French iode, iodine (from Greek ioeidēs, violet-colored : ion, violet + -oeidēs, -oid) + -ine2.]

Online Etymology Dictionary - Cite This Source - Share This
iodine 

WordNet - Cite This Source - Share This

iodine
noun
1.	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)
2.	a tincture consisting of a solution of iodine in ethyl alcohol; applied topically to wounds as an antiseptic [syn: tincture of iodine]

The American Heritage Science Dictionary - Cite This Source - Share This

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.

American Heritage Stedman's Medical Dictionary - Cite This Source - Share This

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.

Webster's Revised Unabridged Dictionary - Cite This Source - Share This

Iodine

I"o*dine\ (?; 104), n. [Gr. ? violetlike; ? a violet + ? form: cf. F. iode, iodine. The name was given from the violet color of its vapor. See Violet, Idyl.] (Chem.) A nonmetallic element, of the halogen group, occurring always in combination, as in the iodides. When isolated it is in the form of dark gray metallic scales, resembling plumbago, soft but brittle, and emitting a chlorinelike odor. Symbol I. Atomic weight 126.5. If heated, iodine volatilizes in beautiful violet vapors.

Note: Iodine was formerly obtained from the ashes of seaweed (kelp or varec), but is now also extracted from certain natural brines. In the free state, iodine, even in very minute quantities, colors starch blue. Iodine and its compounds are largely used in medicine (as in liniments, antisyphilitics, etc.), in photography, in the preparation of aniline dyes, and as an indicator in titration.

Iodine green, an artificial green dyestuff, consisting of an iodine derivative of rosaniline; -- called also night green.

Iodine scarlet, a pigment of an intense scarlet color, consisting of mercuric iodide.

Iodine yellow, a brilliant yellow pigment, consisting of plumbic iodide.