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To separate (a compound) into ions, esp. by dissolving in water. --I`on*i*za"tion (#), n.

Of or pertaining to iridium; -- said specifically of those compounds in which iridium has a relatively high valence.

Of or pertaining to iridium; -- applied specifically to compounds in which iridium has a low valence.

The native compound of iridium and osmium. It is found in flattened metallic grains of extreme hardness, and is often used for pointing gold pens.

An instrument or utensil made of iron; -- chiefly in composition; as, a flatiron, a smoothing iron, etc. My young soldier, put up your iron. Shak.

A European composite herb (Centaurea nigra); -- so called from the resemblance of its knobbed head to an iron ball fixed on a long handle. Dr. Prior.

Incapable of being resolved; not separable into component parts. Irresolvable nebulæ (Astron.), nebulæ of a cloudlike appearance, which have not yet been resolved by the telescope into stars. Sir W. Herschel.

anger or passion; provocation; annoyance; anger. The whole body of the arts and sciences composes one vast machinery for the irritation and development of the human intellect. De Quincey.

A complex nitrogenous radical, C8H4NO2, regarded as the essential residue of a series of compounds, related to isatin, which easily pass by reduction to indigo blue. -- I*sat`o*gen"ic, a.

The ventral and posterior of the three principal bones composing either half of the pelvis; seat bone; the huckle bone.

Any coral of the genus Isis, or family Isidæ, composed of joints of white, stony coral, alternating with flexible, horny joints. See Gorgoniacea.

Having similar proportions, similar relations, or similar differences of composition; -- said specifically of groups or series which differ by a constant difference; as, ethane, ethylene, an acetylene, or their analogous compounds, form an isologous series.

A body or compound which is isomeric with another body or compound; a member of an isomeric series.

Having the same percentage composition; -- said of two or more different substances which contain the same ingredients in the same proportions by weight, often used with with. Specif.: (a) Polymeric; i. e., having the same elements united in the same proportion by weight, but with different molecular weights; as, acety…

ain (metameric) substances, which, while chemically identical (in that they have the same composition, the same molecular weights, and the same ultimate constitution), are yet physically different, as in their action on polarized light, as dextro- and lævo-tartaric acids. In such compounds there is usually at least one…

A substance which is similar to another in crystalline form and composition.

A similarity of crystalline form between substances of similar composition, as between the sulphates of barium (BaSO4) and strontium (SrSO4). It is sometimes extended to include similarity of form between substances of unlike composition, which is more properly called homoeomorphism.

nguages, the group or family of languages of ancient Italy. -- Italic order (Arch.), the composite order. See Composite. -- Italic school, a term given to the Pythagorean and Eleatic philosophers, from the country where their doctrines were first promulgated. -- Italic version. See Itala.

A composition resembling ivory in appearance and used as a substitute for it.

Having jaws; -- chiefly in composition; as, lantern-jawed. "Jawed like a jetty." Skelton.