Find the word definition

Crossword clues for anions

The Collaborative International Dictionary

Ion \I"on\ ([imac]"[o^]n), n. [Gr. 'io`n, neut, of 'iw`n, p. pr. of 'ie`nai to go.]

  1. (Elec. Chem.) an atom or goup of atoms (radical) carrying an electrical charge. It is contrasted with neutral atoms or molecules, and free radicals. Certain compounds, such as sodium chloride, are composed of complementary ions in the solid (crystalline) as well as in solution. Others, notably acids such as hydrogen chloride, may occur as neutral molecules in the pure liquid or gas forms, and ionize almost completely in dilute aqueous solutions. In solutions (as in water) ions are frequently bound non-covalently with the molecules of solvent, and in that case are said to be solvated. According to the electrolytic dissociation theory, the molecules of electrolytes are divided into ions by water and other solvents. An ion consists of one or more atoms and carries one unit charges of electricity, 3.4 x 10^ -10 electrostatic units, or a multiple of this. Those which are positively electrified (hydrogen and the metals) are called cations; negative ions (hydroxyl and acidic atoms or groups) are called anions.

    Note: Thus, hydrochloric acid ( HCl) dissociates, in aqueous solution, into the hydrogen ion, H+, and the chlorine ion, Cl-; ferric nitrate, Fe(NO3)3, yields the ferric ion, Fe+++, and nitrate ions, NO3-, NO3-, NO3-. When a solution containing ions is made part of an electric circuit, the cations move toward the cathode, the anions toward the anode. This movement is called migration, and the velocity of it differs for different kinds of ions. If the electromotive force is sufficient, electrolysis ensues: cations give up their charge at the cathode and separate in metallic form or decompose water, forming hydrogen and alkali; similarly, at the anode the element of the anion separates, or the metal of the anode is dissolved, or decomposition occurs. Aluminum and chlorine are elements prepared predominantly by such electrolysis, and depends on dissolving compounds in a solvent where the element forms ions. Electrolysis is also used in refining other metals, such as copper and silver. Cf. Anion, Cation.

  2. One of the small electrified particles into which the molecules of a gas are broken up under the action of the electric current, of ultraviolet and certain other rays, and of high temperatures. To the properties and behavior of ions the phenomena of the electric discharge through rarefied gases and many other important effects are ascribed. At low pressures the negative ions appear to be electrons; the positive ions, atoms minus an electron. At ordinary pressures each ion seems to include also a number of attached molecules. Ions may be formed in a gas in various ways.


n. (plural of anion English)

Usage examples of "anions".

And I have held converse with birds and fishes in their degree, and that generation which creepeth on the earth is not held in scorn by me, but oft talk I in sweet companionship with the eft of the pond, and the glowworm, and the lady-bird, and the pismire, and their kind, making them my little gossips.

And he said, "Through the Straits of Melikaphkhaz was I borne, and wrecked at last on the lonely shore ten leagues southward from this spot, whither I won alone, having lost my ship and all my dear companions.

But my companions tarry for me in thine halls below, and great matters wait on my direction.

So, going down, he found Lord Juss and his companions sleeping on the cold stones, and the banquet hall empty of all gear and dank with moss and cobwebs, and bats sleeping head-downward among the crumbling roof-beams.

So Brandoch Daha roused his companions, and told Juss how he had fared, and of the weird laid on him by that lady.

Being down, he delayed not to minister to his companions, who came to themselves with heavy groaning.

Very demure, through half-closed eyes, like a panther dozing in the noon-day, he watched his companions at the: feast.

Einon ab Ithel lingered in talk with the abbot, his two companions, having less English, waited civilly a pace aside.

Chapter Nine OWAIN GWYNEDD SENT BACK HIS RESPONSE to the events at Shrewsbury on the day after Anions flight, by the mouth of young John Marchmain, who had remained in Wales to stand surety for Gilbert Prestcote in the exchange of prisoners.

And everywhere men were talking of Anions flight, and debating whether he would get clean away or be hauled back before night in a halter& Hughs muster was not yet common gossip in the town, though by nightfall it surely would be.

It is known to you, as it is to me, that for most men Anions guilt is proven by his flight.

Eliud and his companions would be well into Wales by this time and need not hurry, to tire the invalid too much.

Still, it might be good for our companions' morale, which was probably at a pretty low ebb.

I realized that my companions probably hadn't seen a tree, or even a blade of grass, for many months.

It had everything that the Inner Station lacked and my companions, who hadn't been to Earth for months, appreciated the luxury even more than I did.