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The Collaborative International Dictionary of English v.0.48 (gcide)

Iodine \I"o*dine\ ([imac]"[-o]*d[i^]n or [imac]"[-o]*d[=e]n;
104), n. [Gr. 'iw`dhs violetlike; 'i`on a violet e'i^dos
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 of atomic number
53, 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 126.90. If heated,
iodine volatilizes in beautiful violet vapors.
[1913 Webster]

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.
[1913 Webster]

{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.
[1913 Webster]