from The American Heritage® Dictionary of the English Language, 4th Edition
- n. An atom or a group of atoms that has acquired a net electric charge by gaining or losing one or more electrons.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An atom or group of atoms bearing an electrical charge such as the sodium and chlorine atoms in a salt solution.
from the GNU version of the Collaborative International Dictionary of English
- n. an atom or group 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.
- n. 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.
from The Century Dictionary and Cyclopedia
- n. One of the elements of an electrolyte, or compound body undergoing electrolyzation.
- n. A suffix in abstract nouns (many also used as concrete) of Latin origin, as in legion, opinion, option, region, religion, suspicion, communion, union, etc.
- n. A similar suffix occurring in a few concrete nouns designating persons or things, as in centurion, histrion, union (a pearl), onion, pavilion, etc.
- n. An abbreviation of longitude.
- n. In physical chemistry, one of the particles, bearing electric charges, which carry electric currents through the air or other gas. See electron, 2.
- n. In physical chemistry, the word ion added, as a suffix, to the abbreviated name of an atom or radical to form a name for the atom or radical in the ionic state: thus chlorion means an atom of chlorin in the ionic condition; cuproion or cupriion, the ion of univalent and of bivalent copper.
- n. An abbreviation of Ionic.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a particle that is electrically charged (positive or negative); an atom or molecule or group that has lost or gained one or more electrons
Charcoal has to be re-activated but the sliver-ion is woven into the fabric.
Back-formations are frequently made by dropping - tion or - ion from a noun, and adding - e when appropriate, to form a new verb, such as donate from donation.
In such compounds a metal ion is bound not to a single carbon atom but is "sandwiched" between two aromatic organic molecules.
The company stuck to its story — li-ion is necessary to create a plug-in hybrid that meets the power and energy expectations of most consumers.
After working as a physician for some years, he grew so interested in ion channels that he started to do research in the field: “My scientific career in effect began at the age of 30”, he has admitted.
Disturbances in ion channel function can lead to serious diseases of the nervous system as well as the muscles, e.g. the heart.
Dave Wineland was and is one of the towering figures in ion trapping, so I felt a little foolish, earnestly describing to his group my modest contribution, but I soldiered on through my talk.
The charge of the ion is hence changed from negative to positive, and the ion is repelled from the terminal and accelerated towards the exit of the tube which is earthed.
When for instance proteins in ion channels in the cell membrane are influenced, the excitability of a nerve cell and its ability to send impulses along its branches changes.
This change is due to a phosphorylation of certain ion channel proteins, that is utilizing the molecular mechanism described by Paul Greengard.