, a monobasic acid, consisting of iodine with three parts of oxygen and one of hydrogen.

(I"o*dide) n. (Chem.) A binary compound of iodine, or one which may be regarded as binary; as, potassium iodide.

(I"o*dine) (i"o*din or -den; 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, 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.

Iodine was formerly obtained from the ashes of seaweed 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 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.

(I"o*dism) n. (Med.) A morbid state produced by the use of iodine and its compounds, and characterized by palpitation, depression, and general emaciation, with a pustular eruption upon the skin.

(I"o*dize) v. t. [imp. & p. p. Iodized ; p. pr. & vb. n. Iodizing ] To treat or impregnate with iodine or its compounds; as, to iodize a plate for photography. R. Hunt.

(I"o*di`zer) n. One who, or that which, iodizes.

(I"o*do- I"od-) (Chem.) A prefix, or combining from, indicating iodine as an ingredient; as, iodoform.

(I*od"o*form) n. [Iodo- + formyl. See Formyl, and cf. Chloroform.] (Chem.) A yellow, crystalline, volatile substance, CI3H, having an offensive odor and sweetish taste, and analogous to chloroform. It is used in medicine as a healing and antiseptic dressing for wounds and sores.

(I`o*do*qui"nine) n. [Iodo- + quinine.] (Chem.) A iodide of quinine obtained as a brown substance. It is the base of herapathite. See Herapathite.

(I"o*dous) a. (Chem.) Pertaining to, or containing, iodine. See -ous (chemical suffix).

Iodous acid, a hypothetical acid, analogous to chlorous acid.

(I*od"u*ret) n. (Chem.) Iodide. [Obs.]

(I*od"y*rite) n. [From Iodine.] (Min.) Silver iodide, a mineral of a yellowish color.

(I"o*lite) n. 'i`on a violet + -lite.]—> (Min.) A silicate of alumina, iron, and magnesia, having a bright blue color and vitreous luster; cordierite. It is remarkable for its dichroism, and is also called dichroite.

Io moth
(I"o moth`) (Zoöl.) A large and handsome American moth having a large, bright-colored spot on each hind wing, resembling the spots on the tail of a peacock. The larva is covered with prickly hairs, which sting like nettles.

- ion
(-ion) [L. -io, acc. -ionem: cf. F. -ion.] A noun suffix denoting act, process, result of an act or a process, thing acted upon, state, or condition; as, revolution, the act or process of revolving; construction, the act or process of constructing; a thing constructed; dominion, territory ruled over; subjection, state of being subject; dejection; abstraction.

Iodic acid

  By PanEris using Melati.

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